Move Singleton and related structs to namespace base

chrome/renderer/plugins/plugin_uma.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 "chrome/renderer/plugins/plugin_uma.h"
 
 #include <algorithm>
 #include <cstring>
 
 #include "base/metrics/histogram.h"
@@ skipping 44 matching lines @@
                                 plugin_type,
                                 PluginUMAReporter::PLUGIN_TYPE_MAX);
       break;
     default:
       NOTREACHED();
   }
 }
 
 // static.
 PluginUMAReporter* PluginUMAReporter::GetInstance() {
-  return Singleton<PluginUMAReporter>::get();
+  return base::Singleton<PluginUMAReporter>::get();
 }
 
 void PluginUMAReporter::ReportPluginMissing(const std::string& plugin_mime_type,
                                             const GURL& plugin_src) {
   report_sender_->SendPluginUMA(MISSING_PLUGIN,
                                 GetPluginType(plugin_mime_type, plugin_src));
 }
 
 void PluginUMAReporter::ReportPluginDisabled(
     const std::string& plugin_mime_type,
@@ skipping 102 matching lines @@
     return SHOCKWAVE_FLASH;
   }
 
 #if defined(ENABLE_PEPPER_CDMS)
   if (mime_type == kWidevineCdmPluginMimeType)
     return WIDEVINE_CDM;
 #endif
 
   return UNSUPPORTED_MIMETYPE;
 }