Revert of base: Remove using:: declaration from version.h header.

chrome/browser/hang_monitor/hung_plugin_action.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 <windows.h>
 
 #include "chrome/browser/hang_monitor/hung_plugin_action.h"
 
 #include "base/metrics/histogram.h"
 #include "base/version.h"
@@ skipping 22 matching lines @@
   GTALK_PLUGIN_VERSION_34,
   GTALK_PLUGIN_VERSION_MAX
 };
 
 // Converts the version string of Google Talk Plugin to a version enum. The
 // version format is "major(1 digit).minor(1 digit).sub(1 or 2 digits)",
 // for example, "2.7.10" and "2.8.1". Converts the string to a number as
 // 10 * major + minor - kGTalkPluginLogMinVersion.
 GTalkPluginLogVersion GetGTalkPluginVersion(const base::string16& version) {
   int gtalk_plugin_version = GTALK_PLUGIN_VERSION_MIN;
-  base::Version plugin_version;
+  Version plugin_version;
   content::WebPluginInfo::CreateVersionFromString(version, &plugin_version);
   if (plugin_version.IsValid() && plugin_version.components().size() >= 2) {
     gtalk_plugin_version = 10 * plugin_version.components()[0] +
         plugin_version.components()[1] - kGTalkPluginLogMinVersion;
   }
 
   if (gtalk_plugin_version < GTALK_PLUGIN_VERSION_MIN)
     return GTALK_PLUGIN_VERSION_MIN;
   if (gtalk_plugin_version > GTALK_PLUGIN_VERSION_MAX)
     return GTALK_PLUGIN_VERSION_MAX;
@@ skipping 121 matching lines @@
 void CALLBACK HungPluginAction::HungWindowResponseCallback(HWND target_window,
                                                            UINT message,
                                                            ULONG_PTR data,
                                                            LRESULT result) {
   HungPluginAction* instance = reinterpret_cast<HungPluginAction*>(data);
   DCHECK(NULL != instance);
   if (NULL != instance) {
     instance->OnWindowResponsive(target_window);
   }
 }