Convert string16 to base::string16 in content.

content/test/content_browser_test_test.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 "content/test/content_browser_test.h"
 
 #include "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/test/browser_test_utils.h"
@@ skipping 13 matching lines @@
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     const testing::TestInfo* const test_info =
         testing::UnitTest::GetInstance()->current_test_info();
     if (std::string(test_info->name()) == "SingleProcess")
       command_line->AppendSwitch(switches::kSingleProcess);
   }
 
   void Test() {
     GURL url = GetTestUrl(".", "simple_page.html");
 
-    string16 expected_title(ASCIIToUTF16("OK"));
+    base::string16 expected_title(ASCIIToUTF16("OK"));
     TitleWatcher title_watcher(shell()->web_contents(), expected_title);
     NavigateToURL(shell(), url);
-    string16 title = title_watcher.WaitAndGetTitle();
+    base::string16 title = title_watcher.WaitAndGetTitle();
     EXPECT_EQ(expected_title, title);
   }
 };
 
 IN_PROC_BROWSER_TEST_F(ContentBrowserTestSanityTest, Basic) {
   Test();
 }
 
 IN_PROC_BROWSER_TEST_F(ContentBrowserTestSanityTest, SingleProcess) {
   Test();
 }
 
 }  // namespace content