MacViews: Fix WidgetWithDestroyedNativeViewTest.Test

ui/views/widget/native_widget_mac.mm

 // Copyright 2014 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 "ui/views/widget/native_widget_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 177 matching lines @@
 void NativeWidgetMac::ReorderNativeViews() {
   if (bridge_)
     bridge_->SetRootView(GetWidget()->GetRootView());
 }
 
 void NativeWidgetMac::ViewRemoved(View* view) {
   NOTIMPLEMENTED();
 }
 
 void NativeWidgetMac::SetNativeWindowProperty(const char* name, void* value) {
-  bridge_->SetNativeWindowProperty(name, value);
+  if (bridge_)
+    bridge_->SetNativeWindowProperty(name, value);
 }
 
 void* NativeWidgetMac::GetNativeWindowProperty(const char* name) const {
-  return bridge_->GetNativeWindowProperty(name);
+  if (bridge_)
+    return bridge_->GetNativeWindowProperty(name);
+
+  return nullptr;
 }
 
 TooltipManager* NativeWidgetMac::GetTooltipManager() const {
   NOTIMPLEMENTED();
   return NULL;
 }
 
 void NativeWidgetMac::SetCapture() {
   if (bridge_ && !bridge_->HasCapture())
     bridge_->AcquireCapture();
@@ skipping 426 matching lines @@
 }
 
 // static
 gfx::FontList NativeWidgetPrivate::GetWindowTitleFontList() {
   NOTIMPLEMENTED();
   return gfx::FontList();
 }
 
 }  // namespace internal
 }  // namespace views