Promotes more accessors from WmShell to Shell

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/common/wm/overview/window_selector_controller.h"
 #include "ash/common/wm_shell.h"
+#include "ash/shell.h"
 #include "ui/events/event.h"
 #include "ui/events/event_constants.h"
 
 namespace ash {
 
 // The threshold before engaging overview with a touchpad three-finger scroll.
 const float OverviewGestureHandler::vertical_threshold_pixels_ = 300;
 
 // The threshold before moving selector horizontally when using a touchpad
 // three-finger scroll.
 const float OverviewGestureHandler::horizontal_threshold_pixels_ = 330;
 
 OverviewGestureHandler::OverviewGestureHandler() : scroll_x_(0), scroll_y_(0) {}
 
 OverviewGestureHandler::~OverviewGestureHandler() {}
 
 bool OverviewGestureHandler::ProcessScrollEvent(const ui::ScrollEvent& event) {
   if (event.type() == ui::ET_SCROLL_FLING_START ||
       event.type() == ui::ET_SCROLL_FLING_CANCEL || event.finger_count() != 3) {
     scroll_x_ = scroll_y_ = 0;
     return false;
   }
 
   scroll_x_ += event.x_offset();
   scroll_y_ += event.y_offset();
 
   WindowSelectorController* window_selector_controller =
-      WmShell::Get()->window_selector_controller();
+      Shell::Get()->window_selector_controller();
 
   // Horizontal 3-finger scroll moves selection when already in overview mode.
   if (std::fabs(scroll_x_) >= std::fabs(scroll_y_)) {
     if (!window_selector_controller->IsSelecting()) {
       scroll_x_ = scroll_y_ = 0;
       return false;
     }
     if (std::fabs(scroll_x_) < horizontal_threshold_pixels_)
       return false;
 
@@ skipping 21 matching lines @@
   WmShell::Get()->RecordUserMetricsAction(UMA_TOUCHPAD_GESTURE_OVERVIEW);
   if (window_selector_controller->IsSelecting() &&
       window_selector_controller->AcceptSelection()) {
     return true;
   }
   window_selector_controller->ToggleOverview();
   return true;
 }
 
 }  // namespace ash