Move views::Accelerator to ui in order to use it from aura code.

views/controls/menu/menu.h

Index: views/controls/menu/menu.h
diff --git a/views/controls/menu/menu.h b/views/controls/menu/menu.h
index 9397684ef8d45f55d5f9262fdb79a0f0c130ea20..b6a9633c853a1e89774fc1ebf5439b32cf7dd3ac 100644
--- a/views/controls/menu/menu.h
+++ b/views/controls/menu/menu.h
@@ -19,9 +19,11 @@ namespace gfx {
 class Point;
 }
 
-namespace views {
-
+namespace ui {
 class Accelerator;
+}
+
+namespace views {
 
 class VIEWS_EXPORT Menu {
  public:
@@ -56,7 +58,7 @@ class VIEWS_EXPORT Menu {
     // The delegate needs to implement this function if it wants to display
     // the shortcut text next to each menu item. If there is an accelerator
     // for a given item id, the implementor must return it.
-    virtual bool GetAcceleratorInfo(int id, views::Accelerator* accel) {
+    virtual bool GetAcceleratorInfo(int id, ui::Accelerator* accel) {
       return false;
     }