Consistently use namespaced base::Version in extensions code.

chrome/browser/extensions/external_policy_loader_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 <set>
 #include <string>
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 67 matching lines @@
   }
 
   bool OnExternalExtensionUpdateUrlFound(
       const extensions::ExternalInstallInfoUpdateUrl& info,
       bool is_initial_load) override {
     // Extension has the correct location.
     EXPECT_EQ(Manifest::EXTERNAL_POLICY_DOWNLOAD, info.download_location);
 
     // Provider returns the correct location when asked.
     Manifest::Location location1;
-    std::unique_ptr<Version> version1;
+    std::unique_ptr<base::Version> version1;
     provider_->GetExtensionDetails(info.extension_id, &location1, &version1);
     EXPECT_EQ(Manifest::EXTERNAL_POLICY_DOWNLOAD, location1);
     EXPECT_FALSE(version1.get());
 
     // Remove the extension from our list.
     EXPECT_EQ(1U, expected_extensions_.erase(info.extension_id));
     return true;
   }
 
   void OnExternalProviderReady(
@@ skipping 49 matching lines @@
   forced_extensions.SetString("invalid", "http://www.example.com/crx");
   forced_extensions.SetString("dddddddddddddddddddddddddddddddd",
                               std::string());
   forced_extensions.SetString("invalid", "bad");
 
   MockExternalPolicyProviderVisitor mv;
   mv.Visit(forced_extensions, expected_extensions);
 }
 
 }  // namespace extensions