Extract minimal RenderViewHost interface for embedders, leaving

content/browser/tab_contents/tab_contents.h

Index: content/browser/tab_contents/tab_contents.h
diff --git a/content/browser/tab_contents/tab_contents.h b/content/browser/tab_contents/tab_contents.h
index a5369dbbc4369fbd783c5f214c7f9ff3c0272ab3..dd1cb8b138a24968b39d05111d80a65036f99a13 100644
--- a/content/browser/tab_contents/tab_contents.h
+++ b/content/browser/tab_contents/tab_contents.h
@@ -33,6 +33,7 @@
 class InterstitialPageImpl;
 class LoadNotificationDetails;
 class RenderViewHost;
+class RenderViewHostImpl;
 class SavePackage;
 class SessionStorageNamespaceImpl;
 struct ViewHostMsg_DidFailProvisionalLoadWithError_Params;
@@ -506,6 +507,8 @@ class CONTENT_EXPORT TabContents
   // Save a URL to the local filesystem.
   void SaveURL(const GURL& url, const GURL& referrer, bool is_main_frame);
 
+  RenderViewHostImpl* GetRenderViewHostImpl();
+
   // Stores random bits of data for others to associate with this object.
   // WARNING: this needs to be deleted after NavigationController.
   base::PropertyBag property_bag_;