[WebView] Remove onFailure from VisualStateCallback.

content/public/browser/render_frame_host.h

Index: content/public/browser/render_frame_host.h
diff --git a/content/public/browser/render_frame_host.h b/content/public/browser/render_frame_host.h
index d868430705e66e9724257bdf941424870ae9f7a2..902202804378811b0560e24cb160becc8d5777f7 100644
--- a/content/public/browser/render_frame_host.h
+++ b/content/public/browser/render_frame_host.h
@@ -97,8 +97,7 @@ class CONTENT_EXPORT RenderFrameHost : public IPC::Listener,
   // Roundtrips through the renderer and compositor pipeline to ensure that any
   // changes to the contents resulting from operations executed prior to this
   // call are visible on screen. The call completes asynchronously by running
-  // the supplied |callback| with a value of true upon successful completion and
-  // false otherwise (when the frame is destroyed, detached, etc..).
+  // the supplied |callback|.
   typedef base::Callback<void(bool)> VisualStateCallback;
   virtual void InsertVisualStateCallback(
       const VisualStateCallback& callback) = 0;