Move out DidStartProvisionalLoad from WebContentsImpl into Navigator.

content/browser/frame_host/navigator.h

Index: content/browser/frame_host/navigator.h
diff --git a/content/browser/frame_host/navigator.h b/content/browser/frame_host/navigator.h
index c20c9dd9c1bf437b2672c6ed449bdbb19c46553a..193e69150eb82b324386e539d5b6f4430989e5da 100644
--- a/content/browser/frame_host/navigator.h
+++ b/content/browser/frame_host/navigator.h
@@ -8,10 +8,13 @@
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 
+class GURL;
+
 namespace content {
 
 class NavigationControllerImpl;
 class NavigatorDelegate;
+class RenderFrameHostImpl;
 
 // This class is responsible for performing navigations in a node of the
 // FrameTree. Its lifetime is bound to all FrameTreeNode objects that are
@@ -33,6 +36,13 @@ class CONTENT_EXPORT Navigator : public base::RefCounted<Navigator> {
     return delegate_;
   }
 
+  // The RenderFrameHostImpl started a provisional load.
+  void DidStartProvisionalLoad(RenderFrameHostImpl* render_frame_host,
+                               int64 frame_id,
+                               int64 parent_frame_id,
+                               bool main_frame,
+                               const GURL& url);
+
  private:
   friend class base::RefCounted<Navigator>;
   virtual ~Navigator() {}