Move Singleton and related structs to namespace base

chrome/browser/about_flags.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/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 2087 matching lines @@
       FlagsStorage* flags_storage,
       const std::string& internal_name,
       bool enable);
   void RemoveFlagsSwitches(
       std::map<std::string, base::CommandLine::StringType>* switch_list);
   void ResetAllFlags(FlagsStorage* flags_storage);
   void reset();
 
   // Returns the singleton instance of this class
   static FlagsState* GetInstance() {
-    return Singleton<FlagsState>::get();
+    return base::Singleton<FlagsState>::get();
   }
 
  private:
   bool needs_restart_;
   std::map<std::string, std::string> flags_switches_;
 
   DISALLOW_COPY_AND_ASSIGN(FlagsState);
 };
 
 // Adds the internal names for the specified experiment to |names|.
@@ skipping 594 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags