refactor: remove unused Locker fields (#39842)

refactor: remove unused fields, methods in gin_helper::Locker (#39803)

* refactor: remove unused field gin_helper::Locker::g_is_browser_process

refactor: remove unused field gin_helper::Locker::g_is_renderer_process

refactor: make field const gin_helper::Locker::locker_

* refactor: remove unused declaration gin_helper::Locker::new()

refactor: remove unused declaration gin_helper::Locker::delete()

* refactor: make field const electron::JavascriptEnvironment::locker_

* refactor: remove unused #include gin_helper/locker.h

shell/browser/javascript_environment.h

@@ -49,7 +49,7 @@ class JavascriptEnvironment {
   const raw_ptr<v8::Isolate> isolate_;
 
   // depends-on: isolate_
-  v8::Locker locker_;
+  const v8::Locker locker_;
 
   std::unique_ptr<MicrotasksRunner> microtasks_runner_;
 };

shell/common/gin_helper/event_emitter_caller.cc

@@ -4,7 +4,6 @@
 
 #include "shell/common/gin_helper/event_emitter_caller.h"
 
-#include "shell/common/gin_helper/locker.h"
 #include "shell/common/gin_helper/microtasks_scope.h"
 #include "shell/common/node_includes.h"
 

shell/common/gin_helper/locker.cc

@@ -8,10 +8,9 @@
 
 namespace gin_helper {
 
-Locker::Locker(v8::Isolate* isolate) {
-  if (electron::IsBrowserProcess())
-    locker_ = std::make_unique<v8::Locker>(isolate);
-}
+Locker::Locker(v8::Isolate* isolate)
+    : locker_{electron::IsBrowserProcess() ? new v8::Locker{isolate}
+                                           : nullptr} {}
 
 Locker::~Locker() = default;
 

shell/common/gin_helper/locker.h

@@ -22,12 +22,7 @@ class Locker {
   Locker& operator=(const Locker&) = delete;
 
  private:
-  void* operator new(size_t size);
-  void operator delete(void*, size_t);
-
-  std::unique_ptr<v8::Locker> locker_;
-
-  static bool g_is_browser_process;
+  const std::unique_ptr<v8::Locker> locker_;
 };
 
 }  // namespace gin_helper

shell/common/node_bindings.cc

@@ -30,7 +30,6 @@
 #include "shell/common/gin_helper/dictionary.h"
 #include "shell/common/gin_helper/event.h"
 #include "shell/common/gin_helper/event_emitter_caller.h"
-#include "shell/common/gin_helper/locker.h"
 #include "shell/common/gin_helper/microtasks_scope.h"
 #include "shell/common/mac/main_application_bundle.h"
 #include "third_party/blink/renderer/bindings/core/v8/v8_initializer.h"  // nogncheck