Added UMA stats to overview mode

ash/wm/overview/window_selector_controller.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/overview/window_selector_controller.h"
 
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/root_window_controller.h"
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
@@ skipping 49 matching lines @@
 }
 
 // TODO(nsatragno): Make WindowSelectorController observe the activation of
 // windows, so we can remove WindowSelectorDelegate.
 void WindowSelectorController::OnSelectionEnded() {
   window_selector_.reset();
   last_selection_time_ = base::Time::Now();
 }
 
 void WindowSelectorController::OnSelectionStarted() {
-  Shell* shell = Shell::GetInstance();
-  shell->metrics()->RecordUserMetricsAction(UMA_WINDOW_SELECTION);
   if (!last_selection_time_.is_null()) {
     UMA_HISTOGRAM_LONG_TIMES(
         "Ash.WindowSelector.TimeBetweenUse",
         base::Time::Now() - last_selection_time_);
   }
 }
 
 }  // namespace ash