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

chrome/browser/extensions/pending_extension_info.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/pending_extension_info.h"
 
 #include "base/logging.h"
 
 namespace extensions {
 
 PendingExtensionInfo::PendingExtensionInfo(
     const std::string& id,
     const std::string& install_parameter,
     const GURL& update_url,
-    const base::Version& version,
+    const Version& version,
     ShouldAllowInstallPredicate should_allow_install,
     bool is_from_sync,
     Manifest::Location install_source,
     int creation_flags,
     bool mark_acknowledged,
     bool remote_install)
     : id_(id),
       update_url_(update_url),
       version_(version),
       install_parameter_(install_parameter),
@@ skipping 41 matching lines @@
   // Different install sources; |this| has higher precedence if
   // |install_source_| is the higher priority source.
   Manifest::Location higher_priority_source =
       Manifest::GetHigherPriorityLocation(
           install_source_, other.install_source_);
 
   return higher_priority_source == install_source_ ? 1 : -1;
 }
 
 }  // namespace extensions