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

chrome/browser/net/crl_set_fetcher.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 "chrome/browser/net/crl_set_fetcher.h"
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/rand_util.h"
@@ skipping 126 matching lines @@
 };
 
 void CRLSetFetcher::RegisterComponent(uint32 sequence_of_loaded_crl) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   update_client::CrxComponent component;
   component.pk_hash.assign(kPublicKeySHA256,
                            kPublicKeySHA256 + sizeof(kPublicKeySHA256));
   component.installer = this;
   component.name = "CRLSet";
-  component.version = base::Version(base::UintToString(sequence_of_loaded_crl));
+  component.version = Version(base::UintToString(sequence_of_loaded_crl));
   component.allow_background_download = false;
   if (!component.version.IsValid()) {
     NOTREACHED();
-    component.version = base::Version("0");
+    component.version = Version("0");
   }
 
   if (!cus_->RegisterComponent(component))
     NOTREACHED() << "RegisterComponent returned error";
 }
 
 void CRLSetFetcher::DoDeleteFromDisk() {
   DCHECK_CURRENTLY_ON(BrowserThread::FILE);
 
   DeleteFile(GetCRLSetFilePath(), false /* not recursive */);
@@ skipping 75 matching lines @@
 bool CRLSetFetcher::GetInstalledFile(
     const std::string& file, base::FilePath* installed_file) {
   return false;
 }
 
 bool CRLSetFetcher::Uninstall() {
   return false;
 }
 
 CRLSetFetcher::~CRLSetFetcher() {}