Add explicit base namespace to string16 users.

chrome/common/mac/app_mode_chrome_locator.h

 // 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.
 
 #ifndef CHROME_COMMON_MAC_APP_MODE_CHROME_LOCATOR_H_
 #define CHROME_COMMON_MAC_APP_MODE_CHROME_LOCATOR_H_
 
 #include <CoreFoundation/CoreFoundation.h>
 
 #include "base/strings/string16.h"
@@ skipping 10 matching lines @@
 // Returns true if the bundle was found, false otherwise.
 bool FindBundleById(NSString* bundle_id, base::FilePath* out_bundle);
 
 // Given the path to the Chrome bundle, read the following information:
 // |raw_version_str| - Chrome version.
 // |version_path| - |chrome_bundle|/Contents/Versions/|raw_version_str|/
 // |framework_shlib_path| - Path to the chrome framework's shared library (not
 //                          the framework directory).
 // Returns true if all information read succesfuly, false otherwise.
 bool GetChromeBundleInfo(const base::FilePath& chrome_bundle,
-                         string16* raw_version_str,
+                         base::string16* raw_version_str,
                          base::FilePath* version_path,
                          base::FilePath* framework_shlib_path);
 
 }  // namespace app_mode
 
 #endif  // CHROME_COMMON_MAC_APP_MODE_CHROME_LOCATOR_H_