Eliminate ash::internal namespace

ash/wm/gestures/overview_gesture_handler.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/gestures/overview_gesture_handler.h"
 
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/shell.h"
 #include "ash/wm/coordinate_conversion.h"
 #include "ash/wm/overview/window_selector_controller.h"
 #include "ui/aura/window.h"
 #include "ui/events/event.h"
 #include "ui/events/event_constants.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/screen.h"
 
 namespace ash {
-namespace internal {
-
 namespace {
 
 // The number of pixels from the top of the screen (a virtual bezel) to allow
 // the overview swipe down gesture to begin within. Note this does not actually
 // prevent handling of the touches so a fullscreen page which consumes these can
 // prevent entering overview with a swipe down.
 const int kTopBezelExtraPixels = 5;
 
 // The threshold before engaging overview on a three finger swipe on the
 // touchpad.
@@ skipping 69 matching lines @@
       event.details().touch_points() != 3) {
     return false;
   }
 
   Shell* shell = Shell::GetInstance();
   shell->metrics()->RecordUserMetricsAction(UMA_GESTURE_OVERVIEW);
   shell->window_selector_controller()->ToggleOverview();
   return true;
 }
 
-}  // namespace internal
 }  // namespace ash