Convert HtmlDialogUIDelegate::GetDialogTitle() to string16.

chrome/browser/printing/print_dialog_cloud_unittest.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/printing/print_dialog_cloud.h"
 #include "chrome/browser/printing/print_dialog_cloud_internal.h"
 
 #include <string>
 #include <vector>
 
@@ skipping 85 matching lines @@
                void(CloudPrintHtmlDialogDelegate* delegate));
   MOCK_METHOD0(CreateCloudPrintDataSender,
                scoped_refptr<CloudPrintDataSender>());
 };
 
 class MockCloudPrintHtmlDialogDelegate : public CloudPrintHtmlDialogDelegate {
  public:
   MOCK_CONST_METHOD0(IsDialogModal,
       bool());
   MOCK_CONST_METHOD0(GetDialogTitle,
-      std::wstring());
+      string16());
   MOCK_CONST_METHOD0(GetDialogContentURL,
       GURL());
   MOCK_CONST_METHOD1(GetWebUIMessageHandlers,
       void(std::vector<WebUIMessageHandler*>* handlers));
   MOCK_CONST_METHOD1(GetDialogSize,
       void(gfx::Size* size));
   MOCK_CONST_METHOD0(GetDialogArgs,
       std::string());
   MOCK_METHOD1(OnDialogClosed,
       void(const std::string& json_retval));
@@ skipping 222 matching lines @@
   delegate_->GetWebUIMessageHandlers(&handlers);
   delegate_.reset();
   EXPECT_THAT(mock_flow_handler_.get(), NotNull());
 }
 
 // Testing for ExternalHtmlDialogUI needs a mock TabContents, mock
 // CloudPrintHtmlDialogDelegate (provided through the mock
 // tab_contents)
 
 // Testing for PrintDialogCloud needs a mock Browser.