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

chrome/browser/extensions/updater/extension_updater_unittest.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 <list>
 #include <map>
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 416 matching lines @@
     const bool kIsFromSync = true;
     const bool kMarkAcknowledged = false;
     const bool kRemoteInstall = false;
     std::string id =
         crx_file::id_util::GenerateId(base::StringPrintf("extension%i", i));
 
     pending_extension_manager->AddForTesting(
         PendingExtensionInfo(id,
                              std::string(),
                              update_url,
-                             base::Version(),
+                             Version(),
                              should_allow_install,
                              kIsFromSync,
                              Manifest::INTERNAL,
                              Extension::NO_FLAGS,
                              kMarkAcknowledged,
                              kRemoteInstall));
   }
 }
 
 class ServiceForManifestTests : public MockService {
@@ skipping 713 matching lines @@
     service->OverrideDownloaderDelegate(&delegate);
     updater.Start();
     updater.EnsureDownloaderCreated();
     updater.downloader_->extensions_queue_.set_backoff_policy(
         &kNoBackoffPolicy);
 
     GURL test_url("http://localhost/extension.crx");
 
     std::string id = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
     std::string hash;
-    base::Version version("0.0.1");
+    Version version("0.0.1");
     std::set<int> requests;
     requests.insert(0);
     scoped_ptr<ExtensionDownloader::ExtensionFetch> fetch(
         new ExtensionDownloader::ExtensionFetch(
             id, test_url, hash, version.GetString(), requests));
     updater.downloader_->FetchUpdatedExtension(fetch.Pass());
 
     if (pending) {
       const bool kIsFromSync = true;
       const bool kMarkAcknowledged = false;
@@ skipping 89 matching lines @@
         NULL,
         downloader_factory);
     updater.Start();
     updater.EnsureDownloaderCreated();
     updater.downloader_->extensions_queue_.set_backoff_policy(
         &kNoBackoffPolicy);
 
     GURL test_url(base::StringPrintf("%s/extension.crx", url_prefix.c_str()));
     std::string id = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
     std::string hash;
-    base::Version version("0.0.1");
+  Version version("0.0.1");
     std::set<int> requests;
     requests.insert(0);
     scoped_ptr<ExtensionDownloader::ExtensionFetch> fetch(
         new ExtensionDownloader::ExtensionFetch(
             id, test_url, hash, version.GetString(), requests));
     updater.downloader_->FetchUpdatedExtension(fetch.Pass());
 
     fetcher = factory.GetFetcherByID(ExtensionDownloader::kExtensionFetcherId);
     EXPECT_TRUE(fetcher != NULL && fetcher->delegate() != NULL);
     EXPECT_EQ(kExpectedLoadFlags, fetcher->GetLoadFlags());
@@ skipping 957 matching lines @@
 // -prodversionmin (shouldn't update if browser version too old)
 // -manifests & updates arriving out of order / interleaved
 // -malformed update url (empty, file://, has query, has a # fragment, etc.)
 // -An extension gets uninstalled while updates are in progress (so it doesn't
 //  "come back from the dead")
 // -An extension gets manually updated to v3 while we're downloading v2 (ie
 //  you don't get downgraded accidentally)
 // -An update manifest mentions multiple updates
 
 }  // namespace extensions