Add base:: to string16s in chrome/.

chrome/installer/util/chrome_browser_sxs_operations.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 "chrome/installer/util/chrome_browser_sxs_operations.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "chrome/installer/util/util_constants.h"
 
 namespace installer {
 
 void ChromeBrowserSxSOperations::AppendProductFlags(
-    const std::set<string16>& options,
+    const std::set<base::string16>& options,
     CommandLine* cmd_line) const {
   DCHECK(cmd_line);
 
   cmd_line->AppendSwitch(switches::kChromeSxS);
   ChromeBrowserOperations::AppendProductFlags(options, cmd_line);
 }
 
 void ChromeBrowserSxSOperations::AppendRenameFlags(
-    const std::set<string16>& options,
+    const std::set<base::string16>& options,
     CommandLine* cmd_line) const {
   DCHECK(cmd_line);
 
   cmd_line->AppendSwitch(switches::kChromeSxS);
   ChromeBrowserOperations::AppendRenameFlags(options, cmd_line);
 }
 
 }  // namespace installer