Remove TransparentActivateWindowButton from Overview Mode

ash/wm/overview/scoped_transform_overview_window.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/scoped_transform_overview_window.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/screen_util.h"
@@ skipping 148 matching lines @@
     aura::Window* window) {
   return TransientDescendantIteratorRange(
       TransientDescendantIterator(GetTransientRoot(window)));
 }
 
 }  // namespace
 
 ScopedTransformOverviewWindow::ScopedTransformOverviewWindow(
         aura::Window* window)
     : window_(window),
-      activate_button_(new TransparentActivateWindowButton(
-          window_->GetRootWindow(), this)),
       minimized_(window->GetProperty(aura::client::kShowStateKey) ==
                  ui::SHOW_STATE_MINIMIZED),
       ignored_by_shelf_(wm::GetWindowState(window)->ignored_by_shelf()),
       overview_started_(false),
       original_transform_(window->layer()->GetTargetTransform()),
       original_opacity_(window->layer()->GetTargetOpacity()) {
   DCHECK(window_);
 }
 
 ScopedTransformOverviewWindow::~ScopedTransformOverviewWindow() {
@@ skipping 116 matching lines @@
     window->SetTransform(new_transform);
   }
 }
 
 void ScopedTransformOverviewWindow::SetOpacity(float opacity) {
   for (const auto& window : GetTransientTreeIterator(window_)) {
     window->layer()->SetOpacity(opacity);
   }
 }
 
-void ScopedTransformOverviewWindow::Select() {
-  wm::GetWindowState(window_)->Activate();
-}
-
 void ScopedTransformOverviewWindow::Close() {
   aura::Window* window = GetTransientRoot(window_);
   views::Widget::GetWidgetForNativeView(window)->Close();
 }
 
 void ScopedTransformOverviewWindow::PrepareForOverview() {
   DCHECK(!overview_started_);
   overview_started_ = true;
   wm::GetWindowState(window_)->set_ignored_by_shelf(true);
   ShowWindowIfMinimized();
 }
 
 }  // namespace ash