Move LoadProgressTracker to the browser process.

content/browser/frame_host/render_frame_host_delegate.h

Index: content/browser/frame_host/render_frame_host_delegate.h
diff --git a/content/browser/frame_host/render_frame_host_delegate.h b/content/browser/frame_host/render_frame_host_delegate.h
index b1a15236a59fea955f2ce8addd79f5272de6919a..36a098db889bc46146674cd520b9fd3d1d436ed2 100644
--- a/content/browser/frame_host/render_frame_host_delegate.h
+++ b/content/browser/frame_host/render_frame_host_delegate.h
@@ -44,17 +44,11 @@ class CONTENT_EXPORT RenderFrameHostDelegate {
   // Informs the delegate whenever a RenderFrameHost is deleted.
   virtual void RenderFrameDeleted(RenderFrameHost* render_frame_host) {}
 
-  // The top-level RenderFrame began loading a new page. This corresponds to
-  // Blink's notion of the throbber starting.
-  // |to_different_document| will be true unless the load is a fragment
-  // navigation, or triggered by history.pushState/replaceState.
+  // The top-level RenderFrame began loading a new page. This is a hack to allow
+  // the RenderFrameHost to force a loading spinner to show up; remove.
   virtual void DidStartLoading(RenderFrameHost* render_frame_host,
                                bool to_different_document) {}
 
-  // The top-level RenderFrame stopped loading a page. This corresponds to
-  // Blink's notion of the throbber stopping.
-  virtual void DidStopLoading(RenderFrameHost* render_frame_host) {}
-
   // The RenderFrameHost has been swapped out.
   virtual void SwappedOut(RenderFrameHost* render_frame_host) {}