Make the renderer-side prerendering code use RenderFrames instead of RenderViews.

content/public/renderer/render_view.h

Index: content/public/renderer/render_view.h
===================================================================
--- content/public/renderer/render_view.h	(revision 239602)
+++ content/public/renderer/render_view.h	(working copy)
@@ -34,6 +34,7 @@
 namespace content {
 
 class ContextMenuClient;
+class RenderFrame;
 class RenderViewVisitor;
 struct ContextMenuParams;
 struct SSLStatus;
@@ -50,6 +51,9 @@
   // been closed but not yet destroyed are excluded).
   static void ForEach(RenderViewVisitor* visitor);
 
+  // Returns the main RenderFrame.
+  virtual RenderFrame* GetMainRenderFrame() = 0;
+
   // Get the routing ID of the view.
   virtual int GetRoutingID() const = 0;