Introduce DevToolsExternalAgentProxy interface

content/browser/devtools/render_view_devtools_agent_host.h

Index: content/browser/devtools/render_view_devtools_agent_host.h
diff --git a/content/browser/devtools/render_view_devtools_agent_host.h b/content/browser/devtools/render_view_devtools_agent_host.h
index 436776b5ecbdb872f9703bf6251039c1c81d0ba1..53f89da22005f299f1c83738aee57e2271abb1be 100644
--- a/content/browser/devtools/render_view_devtools_agent_host.h
+++ b/content/browser/devtools/render_view_devtools_agent_host.h
@@ -10,7 +10,7 @@
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
-#include "content/browser/devtools/devtools_agent_host_impl.h"
+#include "content/browser/devtools/ipc_devtools_agent_host.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/render_view_host_observer.h"
 #include "content/public/browser/web_contents_observer.h"
@@ -21,7 +21,7 @@ class RendererOverridesHandler;
 class RenderViewHost;
 
 class CONTENT_EXPORT RenderViewDevToolsAgentHost
-    : public DevToolsAgentHostImpl,
+    : public IPCDevToolsAgentHost,
       private WebContentsObserver {
  public:
   static void OnCancelPendingNavigation(RenderViewHost* pending,
@@ -40,7 +40,7 @@ class CONTENT_EXPORT RenderViewDevToolsAgentHost
   // DevTooolsAgentHost overrides.
   virtual RenderViewHost* GetRenderViewHost() OVERRIDE;
 
-  // DevToolsAgentHostImpl overrides.
+  // IPCDevToolsAgentHost overrides.
   virtual void DispatchOnInspectorBackend(const std::string& message) OVERRIDE;
   virtual void SendMessageToAgent(IPC::Message* msg) OVERRIDE;
   virtual void NotifyClientAttaching() OVERRIDE;