Convert determining restore bounds to use ash/common type

ash/aura/wm_window_aura.cc

 // Copyright 2016 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/aura/wm_window_aura.h"
 
 #include "ash/aura/aura_layout_manager_adapter.h"
 #include "ash/aura/wm_root_window_controller_aura.h"
 #include "ash/aura/wm_shell_aura.h"
 #include "ash/common/ash_constants.h"
@@ skipping 409 matching lines @@
 
 void WmWindowAura::ClearRestoreBounds() {
   window_->ClearProperty(aura::client::kRestoreBoundsKey);
 }
 
 void WmWindowAura::SetRestoreBoundsInScreen(const gfx::Rect& bounds) {
   window_->SetProperty(aura::client::kRestoreBoundsKey, new gfx::Rect(bounds));
 }
 
 gfx::Rect WmWindowAura::GetRestoreBoundsInScreen() const {
-  return *window_->GetProperty(aura::client::kRestoreBoundsKey);
+  gfx::Rect* bounds = window_->GetProperty(aura::client::kRestoreBoundsKey);
+  return bounds ? *bounds : gfx::Rect();
 }
 
 bool WmWindowAura::Contains(const WmWindow* other) const {
   return other
              ? window_->Contains(
                    static_cast<const WmWindowAura*>(other)->window_)
              : false;
 }
 
 void WmWindowAura::SetShowState(ui::WindowShowState show_state) {
@@ skipping 257 matching lines @@
                                               bool visible) {
   FOR_EACH_OBSERVER(WmWindowObserver, observers_,
                     OnWindowVisibilityChanging(this, visible));
 }
 
 void WmWindowAura::OnWindowTitleChanged(aura::Window* window) {
   FOR_EACH_OBSERVER(WmWindowObserver, observers_, OnWindowTitleChanged(this));
 }
 
 }  // namespace ash