[Extensions Bindings] Remove ScriptContext::DispatchEvent

chrome/renderer/extensions/cast_streaming_native_handler.cc

Index: chrome/renderer/extensions/cast_streaming_native_handler.cc
diff --git a/chrome/renderer/extensions/cast_streaming_native_handler.cc b/chrome/renderer/extensions/cast_streaming_native_handler.cc
index 38ab2ae7408a3acac7fb5e813348139a593be654..b2547f6579c77fc7bed54b567e424b6b3d99e40f 100644
--- a/chrome/renderer/extensions/cast_streaming_native_handler.cc
+++ b/chrome/renderer/extensions/cast_streaming_native_handler.cc
@@ -33,6 +33,7 @@
 #include "content/public/child/v8_value_converter.h"
 #include "content/public/renderer/media_stream_utils.h"
 #include "extensions/common/extension.h"
+#include "extensions/renderer/extension_bindings_system.h"
 #include "extensions/renderer/script_context.h"
 #include "media/base/audio_parameters.h"
 #include "media/base/limits.h"
@@ -294,12 +295,15 @@ void FromFrameSenderConfig(const FrameSenderConfig& config,
 // extension. Collision will happen when the first RTP stream keeps alive after
 // creating another 64k-1 RTP streams in the same extension, which is very
 // unlikely to happen in normal use cases.
-CastStreamingNativeHandler::CastStreamingNativeHandler(ScriptContext* context)
+CastStreamingNativeHandler::CastStreamingNativeHandler(
+    ScriptContext* context,
+    ExtensionBindingsSystem* bindings_system)
     : ObjectBackedNativeHandler(context),
       last_transport_id_(
           context->extension()
               ? (((base::Hash(context->extension()->id()) & 0x7fff) << 16) + 1)
               : 1),
+      bindings_system_(bindings_system),
       weak_factory_(this) {
   RouteFunction("CreateSession", "cast.streaming.session",
                 base::Bind(&CastStreamingNativeHandler::CreateCastSession,
@@ -447,36 +451,27 @@ void CastStreamingNativeHandler::CallCreateCallback(
 }
 
 void CastStreamingNativeHandler::CallStartCallback(int stream_id) const {
-  v8::Isolate* isolate = context()->isolate();
-  v8::HandleScope handle_scope(isolate);
-  v8::Context::Scope context_scope(context()->v8_context());
-  v8::Local<v8::Array> event_args = v8::Array::New(isolate, 1);
-  event_args->Set(0, v8::Integer::New(isolate, stream_id));
-  context()->DispatchEvent("cast.streaming.rtpStream.onStarted", event_args);
+  base::ListValue event_args;
+  event_args.AppendInteger(stream_id);
+  bindings_system_->DispatchEventInContext("cast.streaming.rtpStream.onStarted",
+                                           &event_args, nullptr, context());
 }
 
 void CastStreamingNativeHandler::CallStopCallback(int stream_id) const {
-  v8::Isolate* isolate = context()->isolate();
-  v8::HandleScope handle_scope(isolate);
-  v8::Context::Scope context_scope(context()->v8_context());
-  v8::Local<v8::Array> event_args = v8::Array::New(isolate, 1);
-  event_args->Set(0, v8::Integer::New(isolate, stream_id));
-  context()->DispatchEvent("cast.streaming.rtpStream.onStopped", event_args);
+  base::ListValue event_args;
+  event_args.AppendInteger(stream_id);
+  bindings_system_->DispatchEventInContext("cast.streaming.rtpStream.onStopped",
+                                           &event_args, nullptr, context());
 }
 
 void CastStreamingNativeHandler::CallErrorCallback(
     int stream_id,
     const std::string& message) const {
-  v8::Isolate* isolate = context()->isolate();
-  v8::HandleScope handle_scope(isolate);
-  v8::Context::Scope context_scope(context()->v8_context());
-  v8::Local<v8::Array> event_args = v8::Array::New(isolate, 2);
-  event_args->Set(0, v8::Integer::New(isolate, stream_id));
-  event_args->Set(
-      1,
-      v8::String::NewFromUtf8(
-          isolate, message.data(), v8::String::kNormalString, message.size()));
-  context()->DispatchEvent("cast.streaming.rtpStream.onError", event_args);
+  base::ListValue event_args;
+  event_args.AppendInteger(stream_id);
+  event_args.AppendString(message);
+  bindings_system_->DispatchEventInContext("cast.streaming.rtpStream.onError",
+                                           &event_args, nullptr, context());
 }
 
 void CastStreamingNativeHandler::DestroyCastRtpStream(