Relanding http://codereview.chromium.org/2870050/show.

chrome/browser/renderer_host/render_widget_host.h

Index: chrome/browser/renderer_host/render_widget_host.h
diff --git a/chrome/browser/renderer_host/render_widget_host.h b/chrome/browser/renderer_host/render_widget_host.h
index c7e3cd663486a55c08fa6dd51e713d8e9a2d156f..0b0e114a1e8982ee64e60821fb10ec85488a8dea 100644
--- a/chrome/browser/renderer_host/render_widget_host.h
+++ b/chrome/browser/renderer_host/render_widget_host.h
@@ -245,9 +245,6 @@ class RenderWidgetHost : public IPC::Channel::Listener,
   // Returns the video layer if it exists, NULL otherwise.
   VideoLayer* video_layer() const { return video_layer_.get(); }
 
-  // Checks to see if we can give up focus to this widget through a JS call.
-  virtual bool CanBlur() const { return true; }
-
   // Starts a hang monitor timeout. If there's already a hang monitor timeout
   // the new one will only fire if it has a shorter delay than the time
   // left on the existing timeouts.