[Extensions Bindings] Remove ScriptContext::DispatchEvent

extensions/renderer/display_source_custom_bindings.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_RENDERER_DISPLAY_SOURCE_CUSTOM_BINDINGS_H_
 #define EXTENSIONS_RENDERER_DISPLAY_SOURCE_CUSTOM_BINDINGS_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "extensions/common/api/display_source.h"
 #include "extensions/renderer/api/display_source/display_source_session.h"
 #include "extensions/renderer/object_backed_native_handler.h"
 #include "v8/include/v8.h"
 
 namespace extensions {
+class ExtensionBindingsSystem;
 class ScriptContext;
 
 // Implements custom bindings for the displaySource API.
 class DisplaySourceCustomBindings : public ObjectBackedNativeHandler {
  public:
-  explicit DisplaySourceCustomBindings(ScriptContext* context);
+  DisplaySourceCustomBindings(ScriptContext* context,
+                              ExtensionBindingsSystem* bindings_system);
 
   ~DisplaySourceCustomBindings() override;
 
  private:
   //  ObjectBackedNativeHandler override.
   void Invalidate() override;
 
   void StartSession(
       const v8::FunctionCallbackInfo<v8::Value>& args);
   void TerminateSession(
@@ skipping 14 matching lines @@
 
   // DisplaySession notification callbacks.
   void OnSessionTerminated(int sink_id);
   void OnSessionError(int sink_id,
                       DisplaySourceErrorType type,
                       const std::string& message);
 
   DisplaySourceSession* GetDisplaySession(int sink_id) const;
 
   std::map<int, std::unique_ptr<DisplaySourceSession>> session_map_;
+
+  ExtensionBindingsSystem* bindings_system_;
+
   base::WeakPtrFactory<DisplaySourceCustomBindings> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplaySourceCustomBindings);
 };
 
 }  // extensions
 
 #endif  // EXTENSIONS_RENDERER_DISPLAY_SOURCE_CUSTOM_BINDINGS_H_