Fixes for -Wunused-function on Linux, Android and ChromeOS

ash/extended_desktop_unittest.cc

 // Copyright (c) 2012 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/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
@@ skipping 24 matching lines @@
 namespace {
 
 void SetSecondaryDisplayLayout(DisplayLayout::Position position) {
   DisplayLayout layout =
       Shell::GetInstance()->display_manager()->GetCurrentDisplayLayout();
   layout.position = position;
   Shell::GetInstance()->display_manager()->
       SetLayoutForCurrentDisplays(layout);
 }
 
-internal::DisplayManager* GetDisplayManager() {
-  return Shell::GetInstance()->display_manager();
-}
-
 class ModalWidgetDelegate : public views::WidgetDelegateView {
  public:
   ModalWidgetDelegate() {}
   virtual ~ModalWidgetDelegate() {}
 
   // Overridden from views::WidgetDelegate:
   virtual views::View* GetContentsView() OVERRIDE {
     return this;
   }
   virtual ui::ModalType GetModalType() const OVERRIDE {
@@ skipping 783 matching lines @@
   generator.ReleaseLeftButton();
   EXPECT_EQ("-999,-999 -999,-999", event_handler.GetLocationsAndReset());
 
   generator.MoveMouseTo(400, 150);
   EXPECT_EQ("100,150 100,150", event_handler.GetLocationsAndReset());
 
   ash::Shell::GetInstance()->RemovePreTargetHandler(&event_handler);
 }
 
 }  // namespace ash