[Chromecast] Clarify lifetime of CastGinRunner.

chromecast/renderer/cast_content_renderer_client.cc

 // Copyright 2014 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.
 
 #include "chromecast/renderer/cast_content_renderer_client.h"
 
 #include <stdint.h>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 130 matching lines @@
 }
 
 void CastContentRendererClient::RunScriptsAtDocumentStart(
     content::RenderFrame* render_frame) {
   // This method enables Mojo bindings in JavaScript for Chromecast.
 
   v8::HandleScope handle_scope(blink::mainThreadIsolate());
   v8::Local<v8::Context> context =
       render_frame->GetWebFrame()->mainWorldScriptContext();
 
-  // CastGinRunner manages its own lifetime.
-  CastGinRunner* runner = new CastGinRunner(render_frame);
+  CastGinRunner* runner = CastGinRunner::Get(render_frame);
   gin::Runner::Scope scoper(runner);
 
   // Initialize AMD API for Mojo.
   render_frame->EnsureMojoBuiltinsAreAvailable(context->GetIsolate(), context);
   gin::ModuleRegistry::InstallGlobals(context->GetIsolate(), context->Global());
 
   // Inject JavaScript files in the correct dependency order.
   static const int mojo_resource_ids[] = {
       IDR_MOJO_UNICODE_JS,
       IDR_MOJO_BUFFER_JS,
@@ skipping 11 matching lines @@
 
 void ExecuteJavaScript(content::RenderFrame* render_frame, int resource_id) {
   const std::string& js_string = ui::ResourceBundle::GetSharedInstance()
                                      .GetRawDataResource(resource_id)
                                      .as_string();
   render_frame->ExecuteJavaScript(base::UTF8ToUTF16(js_string));
 }
 
 }  // namespace shell
 }  // namespace chromecast