Add OnDisplayMetricsChanged in DisplayObserver.

content/browser/renderer_host/render_widget_host_view_aura.h

Index: content/browser/renderer_host/render_widget_host_view_aura.h
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.h b/content/browser/renderer_host/render_widget_host_view_aura.h
index a466218dd2dfc4a6c1d629b70fa512d3ac2f4132..0a9ceb8d7a92a67c6739a72ffa93cc1941ca35ce 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.h
+++ b/content/browser/renderer_host/render_widget_host_view_aura.h
@@ -259,9 +259,10 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   virtual void OnCandidateWindowHidden() OVERRIDE;
 
   // Overridden from gfx::DisplayObserver:
-  virtual void OnDisplayBoundsChanged(const gfx::Display& display) OVERRIDE;
   virtual void OnDisplayAdded(const gfx::Display& new_display) OVERRIDE;
   virtual void OnDisplayRemoved(const gfx::Display& old_display) OVERRIDE;
+  virtual void OnDisplayMetricsChanged(const gfx::Display& display,
+                                       uint32_t metrics) OVERRIDE;
 
   // Overridden from aura::WindowDelegate:
   virtual gfx::Size GetMinimumSize() const OVERRIDE;