Eliminate ash::internal namespace

ash/keyboard_overlay/keyboard_overlay_view.h

Index: ash/keyboard_overlay/keyboard_overlay_view.h
diff --git a/ash/keyboard_overlay/keyboard_overlay_view.h b/ash/keyboard_overlay/keyboard_overlay_view.h
index 0fc339ad51ef4c22b6a03dfb7787f4a2e03228c1..2fb0a59ee75e8c51b9439a071b6ac049c464a703 100644
--- a/ash/keyboard_overlay/keyboard_overlay_view.h
+++ b/ash/keyboard_overlay/keyboard_overlay_view.h
@@ -28,7 +28,7 @@ namespace ash {
 // A customized dialog view for the keyboard overlay.
 class ASH_WITH_CONTENT_EXPORT KeyboardOverlayView
     : public views::WebDialogView,
-      public ash::internal::OverlayEventFilter::Delegate {
+      public ash::OverlayEventFilter::Delegate {
  public:
   struct KeyEventData {
     ui::KeyboardCode key_code;
@@ -40,7 +40,7 @@ class ASH_WITH_CONTENT_EXPORT KeyboardOverlayView
                       WebContentsHandler* handler);
   virtual ~KeyboardOverlayView();
 
-  // Overridden from ash::internal::OverlayEventFilter::Delegate:
+  // Overridden from ash::OverlayEventFilter::Delegate:
   virtual void Cancel() OVERRIDE;
   virtual bool IsCancelingKeyEvent(ui::KeyEvent* event) OVERRIDE;
   virtual aura::Window* GetWindow() OVERRIDE;