wstring: convert all SetPageTitle APIs to use string16

chrome/browser/ui/views/tab_contents/native_tab_contents_view_aura.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 "chrome/browser/ui/views/tab_contents/native_tab_contents_view_aura.h"
 
 #include "chrome/browser/tab_contents/web_drop_target_win.h"
 #include "chrome/browser/ui/views/tab_contents/native_tab_contents_view_delegate.h"
 #include "chrome/browser/ui/views/tab_contents/native_tab_contents_view_views.h"
 #include "chrome/browser/renderer_host/render_widget_host_view_views.h"
@@ skipping 49 matching lines @@
   NOTIMPLEMENTED();
   return NULL;
 }
 
 gfx::NativeWindow NativeTabContentsViewAura::GetTopLevelNativeWindow() const {
   // TODO(beng):
   NOTIMPLEMENTED();
   return NULL;
 }
 
-void NativeTabContentsViewAura::SetPageTitle(const std::wstring& title) {
+void NativeTabContentsViewAura::SetPageTitle(const string16& title) {
   // TODO(beng):
   NOTIMPLEMENTED();
 }
 
 void NativeTabContentsViewAura::StartDragging(const WebDropData& drop_data,
                                              WebKit::WebDragOperationsMask ops,
                                              const SkBitmap& image,
                                              const gfx::Point& image_offset) {
   // TODO(beng):
   NOTIMPLEMENTED();
@@ skipping 25 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeTabContentsView, public:
 
 // static
 NativeTabContentsView* NativeTabContentsView::CreateNativeTabContentsView(
     internal::NativeTabContentsViewDelegate* delegate) {
   return new NativeTabContentsViewViews(delegate);
   // return new NativeTabContentsViewAura(delegate);
 }