aura_shell/examples: Fix build on Linux.

ui/aura_shell/examples/bubble.cc

 // Copyright (c) 2011 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 "base/utf_string_conversions.h"
 #include "views/bubble/bubble_border.h"
 #include "views/bubble/bubble_delegate.h"
 #include "views/bubble/bubble_view.h"
 #include "views/controls/label.h"
 #include "views/widget/widget.h"
@@ skipping 33 matching lines @@
 void CreateBubble(const BubbleConfig& config,
                   gfx::NativeWindow parent) {
   views::Widget* bubble_widget = new views::Widget;
   views::Widget::InitParams params(views::Widget::InitParams::TYPE_BUBBLE);
   params.delegate = new ExampleBubbleDelegateView(config, bubble_widget);
   params.transparent = true;
   params.bounds = config.bound;
   params.parent = parent;
   bubble_widget->Init(params);
   bubble_widget->client_view()->AsBubbleView()->AddChildView(
-      new views::Label(L"I am a " + config.label));
+      new views::Label(L"I am a " + UTF16ToWideHack(config.label)));
 }
 
 void CreatePointyBubble(gfx::NativeWindow parent, const gfx::Point& origin) {
   BubbleConfig config;
   config.label = ASCIIToUTF16("PointyBubble");
   config.color = SK_ColorWHITE;
   config.bound = gfx::Rect(origin.x(), origin.y(), 180, 180);
   config.arrow = views::BubbleBorder::TOP_LEFT;
   config.fade_out = false;
   CreateBubble(config, parent);
 }
 
 }  // namespace examples
 }  // namespace aura_shell