Convert string16 to base::string16 in content.

content/browser/session_history_browsertest.cc

 // Copyright (c) 2012 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/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
@@ skipping 81 matching lines @@
     return shell()->web_contents()->GetLastCommittedURL();
   }
 
   GURL GetURL(const std::string file) {
     return embedded_test_server()->GetURL(
         std::string("/session_history/") + file);
   }
 
   void NavigateAndCheckTitle(const char* filename,
                              const std::string& expected_title) {
-    string16 expected_title16(ASCIIToUTF16(expected_title));
+    base::string16 expected_title16(ASCIIToUTF16(expected_title));
     TitleWatcher title_watcher(shell()->web_contents(), expected_title16);
     NavigateToURL(shell(), GetURL(filename));
     ASSERT_EQ(expected_title16, title_watcher.WaitAndGetTitle());
   }
 
   bool CanGoBack() {
     return shell()->web_contents()->GetController().CanGoBack();
   }
 
   bool CanGoForward() {
@@ skipping 377 matching lines @@
   NavigateToURL(shell(), GetURL("title2.html"));
 
   ASSERT_TRUE(ExecuteScriptAndExtractInt(
       shell()->web_contents(),
       "domAutomationController.send(history.length)",
       &length));
   EXPECT_EQ(2, length);
 }
 
 }  // namespace content