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

chrome/browser/extensions/extension_management_internal.cc

 // Copyright 2014 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/extensions/extension_management_internal.h"
 
 #include "base/logging.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "chrome/browser/extensions/extension_management_constants.h"
@@ skipping 118 matching lines @@
         permissions_to_merge_from, permissions_parsed, &blocked_permissions);
   }
 
   // Parses the minimum version settings.
   std::string minimum_version_required_str;
   if (scope == SCOPE_INDIVIDUAL &&
       dict->GetStringWithoutPathExpansion(
           schema_constants::kMinimumVersionRequired,
           &minimum_version_required_str)) {
     scoped_ptr<base::Version> version(
-        new base::Version(minimum_version_required_str));
+        new Version(minimum_version_required_str));
     // We accept a general version string here. Note that count of components in
     // version string of extensions is limited to 4.
     if (!version->IsValid())
       LOG(WARNING) << kMalformedPreferenceWarning;
     else
       minimum_version_required = version.Pass();
   }
 
   return true;
 }
@@ skipping 14 matching lines @@
 void GlobalSettings::Reset() {
   has_restricted_install_sources = false;
   install_sources.ClearPatterns();
   has_restricted_allowed_types = false;
   allowed_types.clear();
 }
 
 }  // namespace internal
 
 }  // namespace extensions