fix: `ElectronBrowserContext` `raw_ptr` bug + remove dead code (#46030)

refactor: remove unused ElectronBrowserContext::extension_system()

Last use removed on Jul 21, 2020 by 2fb14f5 in PR #24575

This fixes a raw_ptr warning by letting us remove the raw_ptr field
`ElectronBrowserContext::extension_system_`.

shell/browser/electron_browser_context.cc

@@ -365,10 +365,10 @@ ElectronBrowserContext::ElectronBrowserContext(
     BrowserContextDependencyManager::GetInstance()
         ->CreateBrowserContextServices(this);
 
-    extension_system_ = static_cast<extensions::ElectronExtensionSystem*>(
+    auto* extension_system = static_cast<extensions::ElectronExtensionSystem*>(
         extensions::ExtensionSystem::Get(this));
-    extension_system_->InitForRegularProfile(true /* extensions_enabled */);
-    extension_system_->FinishInitialization();
+    extension_system->InitForRegularProfile(true /* extensions_enabled */);
+    extension_system->FinishInitialization();
   }
 #endif
 }
@@ -377,11 +377,6 @@ ElectronBrowserContext::~ElectronBrowserContext() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   NotifyWillBeDestroyed();
 
-#if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
-  // the DestroyBrowserContextServices() call below frees this.
-  extension_system_ = nullptr;
-#endif
-
   // Notify any keyed services of browser context destruction.
   BrowserContextDependencyManager::GetInstance()->DestroyBrowserContextServices(
       this);

shell/browser/electron_browser_context.h

@@ -13,12 +13,10 @@
 #include <variant>
 #include <vector>
 
-#include "base/memory/raw_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/media_stream_request.h"
 #include "content/public/browser/resource_context.h"
-#include "electron/buildflags/buildflags.h"
 #include "electron/shell/browser/media/media_device_id_salt.h"
 #include "mojo/public/cpp/bindings/remote.h"
 #include "services/network/public/mojom/ssl_config.mojom.h"
@@ -43,12 +41,6 @@ namespace storage {
 class SpecialStoragePolicy;
 }
 
-#if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
-namespace extensions {
-class ElectronExtensionSystem;
-}
-#endif
-
 namespace electron {
 
 class ElectronDownloadManagerDelegate;
@@ -154,15 +146,6 @@ class ElectronBrowserContext : public content::BrowserContext {
     return weak_factory_.GetWeakPtr();
   }
 
-#if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
-  extensions::ElectronExtensionSystem* extension_system() {
-    // Guard usages of extension_system() with !IsOffTheRecord()
-    // There is no extension system for in-memory sessions
-    DCHECK(!IsOffTheRecord());
-    return extension_system_;
-  }
-#endif
-
   ProtocolRegistry* protocol_registry() const {
     return protocol_registry_.get();
   }
@@ -237,11 +220,6 @@ class ElectronBrowserContext : public content::BrowserContext {
   bool use_cache_ = true;
   int max_cache_size_ = 0;
 
-#if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
-  // Owned by the KeyedService system.
-  raw_ptr<extensions::ElectronExtensionSystem> extension_system_;
-#endif
-
   // Shared URLLoaderFactory.
   scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory_;