derefence weak ptr only on the same sequence runner it was created in

atom/browser/atom_download_manager_delegate.cc

@@ -21,6 +21,32 @@
 
 namespace atom {
 
+namespace {
+
+// Generate default file path to save the download.
+void CreateDownloadPath(
+    const GURL& url,
+    const std::string& content_disposition,
+    const std::string& suggested_filename,
+    const std::string& mime_type,
+    const base::FilePath& default_download_path,
+    const AtomDownloadManagerDelegate::CreateDownloadPathCallback& callback) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::FILE);
+
+  auto generated_name =
+      net::GenerateFileName(url, content_disposition, std::string(),
+                            suggested_filename, mime_type, "download");
+
+  if (!base::PathExists(default_download_path))
+    base::CreateDirectory(default_download_path);
+
+  base::FilePath path(default_download_path.Append(generated_name));
+  content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
+                                   base::Bind(callback, path));
+}
+
+}  // namespace
+
 AtomDownloadManagerDelegate::AtomDownloadManagerDelegate(
     content::DownloadManager* manager)
     : download_manager_(manager),
@@ -46,30 +72,6 @@ void AtomDownloadManagerDelegate::GetItemSavePath(content::DownloadItem* item,
     *path = download->GetSavePath();
 }
 
-void AtomDownloadManagerDelegate::CreateDownloadPath(
-    const GURL& url,
-    const std::string& content_disposition,
-    const std::string& suggested_filename,
-    const std::string& mime_type,
-    const base::FilePath& default_download_path,
-    const CreateDownloadPathCallback& callback) {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::FILE);
-
-  auto generated_name = net::GenerateFileName(url,
-                                              content_disposition,
-                                              std::string(),
-                                              suggested_filename,
-                                              mime_type,
-                                              "download");
-
-  if (!base::PathExists(default_download_path))
-    base::CreateDirectory(default_download_path);
-
-  base::FilePath path(default_download_path.Append(generated_name));
-  content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
-                                   base::Bind(callback, path));
-}
-
 void AtomDownloadManagerDelegate::OnDownloadPathGenerated(
     uint32_t download_id,
     const content::DownloadTargetCallback& callback,
@@ -164,14 +166,10 @@ bool AtomDownloadManagerDelegate::DetermineDownloadTarget(
 
   content::BrowserThread::PostTask(
       content::BrowserThread::FILE, FROM_HERE,
-      base::Bind(&AtomDownloadManagerDelegate::CreateDownloadPath,
-                 weak_ptr_factory_.GetWeakPtr(),
-                 download->GetURL(),
+      base::Bind(&CreateDownloadPath, download->GetURL(),
                  download->GetContentDisposition(),
-                 download->GetSuggestedFilename(),
-                 download->GetMimeType(),
-                 default_download_path,
-                 download_path_callback));
+                 download->GetSuggestedFilename(), download->GetMimeType(),
+                 default_download_path, download_path_callback));
   return true;
 }
 

atom/browser/atom_download_manager_delegate.h

@@ -24,13 +24,6 @@ class AtomDownloadManagerDelegate : public content::DownloadManagerDelegate {
   explicit AtomDownloadManagerDelegate(content::DownloadManager* manager);
   virtual ~AtomDownloadManagerDelegate();
 
-  // Generate default file path to save the download.
-  void CreateDownloadPath(const GURL& url,
-                          const std::string& suggested_filename,
-                          const std::string& content_disposition,
-                          const std::string& mime_type,
-                          const base::FilePath& path,
-                          const CreateDownloadPathCallback& callback);
   void OnDownloadPathGenerated(uint32_t download_id,
                                const content::DownloadTargetCallback& callback,
                                const base::FilePath& default_path);

atom/browser/net/atom_cert_verifier.cc

@@ -94,25 +94,27 @@ class CertVerifierRequest : public AtomCertVerifier::Request {
     request->default_result = net::ErrorToString(error);
     request->error_code = error;
     request->certificate = params_.certificate();
+    auto response_callback = base::Bind(&CertVerifierRequest::OnResponseInUI,
+                                        weak_ptr_factory_.GetWeakPtr());
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&CertVerifierRequest::OnVerifyRequestInUI,
-                   weak_ptr_factory_.GetWeakPtr(),
-                   cert_verifier_->verify_proc(),
-                   base::Passed(&request)));
+                   cert_verifier_->verify_proc(), base::Passed(&request),
+                   response_callback));
   }
 
-  void OnVerifyRequestInUI(const AtomCertVerifier::VerifyProc& verify_proc,
-                           std::unique_ptr<VerifyRequestParams> request) {
-    verify_proc.Run(*(request.get()),
-                    base::Bind(&CertVerifierRequest::OnResponseInUI,
-                               weak_ptr_factory_.GetWeakPtr()));
+  static void OnVerifyRequestInUI(
+      const AtomCertVerifier::VerifyProc& verify_proc,
+      std::unique_ptr<VerifyRequestParams> request,
+      const base::Callback<void(int)>& response_callback) {
+    verify_proc.Run(*(request.get()), response_callback);
   }
 
-  void OnResponseInUI(int result) {
-    BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
-                            base::Bind(&CertVerifierRequest::NotifyResponseInIO,
-                                       weak_ptr_factory_.GetWeakPtr(), result));
+  static void OnResponseInUI(base::WeakPtr<CertVerifierRequest> self,
+                             int result) {
+    BrowserThread::PostTask(
+        BrowserThread::IO, FROM_HERE,
+        base::Bind(&CertVerifierRequest::NotifyResponseInIO, self, result));
   }
 
   void NotifyResponseInIO(int result) {