Add a new GetInstance() method for singleton classes used in chrome/browser files.

chrome/browser/oom_priority_manager.cc

 // Copyright (c) 2010 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/oom_priority_manager.h"
 
 #include <list>
 
 #include "base/process.h"
 #include "base/process_util.h"
@@ skipping 148 matching lines @@
   const int kMaxPriority = 10;
   const int kPriorityRange = kMaxPriority - kMinPriority;
   float priority_increment =
       static_cast<float>(kPriorityRange) / renderer_stats.size();
   float priority = kMinPriority;
   std::set<base::ProcessHandle> already_seen;
   for (StatsList::iterator iterator = renderer_stats.begin();
        iterator != renderer_stats.end(); ++iterator) {
     if (already_seen.find(iterator->renderer_handle) == already_seen.end()) {
       already_seen.insert(iterator->renderer_handle);
-      Singleton<ZygoteHost>::get()->AdjustRendererOOMScore(
+      ZygoteHost::GetInstance()->AdjustRendererOOMScore(
           iterator->renderer_handle,
           static_cast<int>(priority + 0.5f));
       priority += priority_increment;
     }
   }
 }
 
 }  // namespace browser