Introduce EmbeddedWorkerDevToolsAgent.

EmbeddedWorkerDevToolsAgent is registered to RenderThreadImpl with worker_devtools_agent_route_id which will be introduced by https://codereview.chromium.org/252633003.

This change depends on  https://codereview.chromium.org/252633003/.

BUG=358657

Review URL: https://codereview.chromium.org/251723002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@267363 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 65883c7..fccaa70 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -373,8 +373,8 @@
   void WidgetHidden();
   void WidgetRestored();
 
-  void AddSharedWorkerRoute(int32 routing_id, IPC::Listener* listener);
-  void RemoveSharedWorkerRoute(int32 routing_id);
+  void AddEmbeddedWorkerRoute(int32 routing_id, IPC::Listener* listener);
+  void RemoveEmbeddedWorkerRoute(int32 routing_id);
 
  private:
   // ChildThread