Custom buttons should only handle accelerators when focused.

ui/views/controls/button/custom_button.h

Index: ui/views/controls/button/custom_button.h
diff --git a/ui/views/controls/button/custom_button.h b/ui/views/controls/button/custom_button.h
index 713cdeaa80a44297c604e2b94dc4264fade7cc59..869bcd77af5dac05115312e726c984cf58aac1cf 100644
--- a/ui/views/controls/button/custom_button.h
+++ b/ui/views/controls/button/custom_button.h
@@ -135,6 +135,11 @@ class VIEWS_EXPORT CustomButton : public Button,
   scoped_ptr<gfx::ThrobAnimation> hover_animation_;
 
  private:
+  // Returns true if this is not a top level widget. Virtual for tests.
+  virtual bool IsChildWidget() const;
+  // Returns true if the focus is not in a top level widget. Virtual for tests.
+  virtual bool FocusInChildWidget() const;
+
   // Should we animate when the state changes? Defaults to true.
   bool animate_on_state_change_;