Move out DidStartProvisionalLoad from WebContentsImpl into Navigator.

content/browser/frame_host/navigation_controller_delegate.h

Index: content/browser/frame_host/navigation_controller_delegate.h
diff --git a/content/browser/frame_host/navigation_controller_delegate.h b/content/browser/frame_host/navigation_controller_delegate.h
index cb3204cde6326eb0f931c4865e4f1ab3be124aa0..18bf3b03d4907f579b11eae756cd8f2ab5f7ddf6 100644
--- a/content/browser/frame_host/navigation_controller_delegate.h
+++ b/content/browser/frame_host/navigation_controller_delegate.h
@@ -16,6 +16,7 @@ struct LoadNotificationDetails;
 struct NativeWebKeyboardEvent;
 class InterstitialPage;
 class InterstitialPageImpl;
+class RenderFrameHost;
 class RenderViewHost;
 class SiteInstance;
 class WebContents;
@@ -72,6 +73,19 @@ class NavigationControllerDelegate {
   virtual void SetIsLoading(RenderViewHost* render_view_host,
                             bool is_loading,
                             LoadNotificationDetails* details) = 0;
+
+  // Actual navigation delegates.

[Charlie Reis, 2013/11/07 01:22:43]

What does this mean?

+  virtual void DidStartProvisionalLoad(
+      int64 frame_id,
+      int64 parent_frame_id,
+      bool is_main_frame,
+      const GURL& validated_url,
+      bool is_error_page,
+      bool is_iframe_srcdoc,
+      RenderFrameHost* render_frame_host) = 0;
+  virtual void ProvisionalChangeToMainFrameUrl(
+      const GURL& url,
+      RenderFrameHost* render_frame_host) = 0;
 };
 
 }  // namespace content