[ServiceWorker] Add EmbeddedWorkerInstanceHost Interface.

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 83960ac56a5609252c1fef93fd6d9e8026010b0c..abd03c41fe772d8cf200b3711d096ad7dac0287f 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -118,7 +118,6 @@ class CompositorForwardingMessageFilter;
 class DBMessageFilter;
 class DevToolsAgentFilter;
 class DomStorageDispatcher;
-class EmbeddedWorkerDispatcher;
 class FrameSwapMessageQueue;
 class IndexedDBDispatcher;
 class InputHandlerManager;
@@ -308,10 +307,6 @@ class CONTENT_EXPORT RenderThreadImpl
     return dom_storage_dispatcher_.get();
   }
 
-  EmbeddedWorkerDispatcher* embedded_worker_dispatcher() const {
-    return embedded_worker_dispatcher_.get();
-  }
-
   AudioInputMessageFilter* audio_input_message_filter() {
     return audio_input_message_filter_.get();
   }
@@ -604,7 +599,6 @@ class CONTENT_EXPORT RenderThreadImpl
   std::unique_ptr<RendererBlinkPlatformImpl> blink_platform_impl_;
   std::unique_ptr<ResourceDispatchThrottler> resource_dispatch_throttler_;
   std::unique_ptr<CacheStorageDispatcher> main_thread_cache_storage_dispatcher_;
-  std::unique_ptr<EmbeddedWorkerDispatcher> embedded_worker_dispatcher_;
 
   // Used on the render thread and deleted by WebKit at shutdown.
   blink::WebMediaStreamCenter* media_stream_center_;