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

content/common/webplugininfo_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 "content/public/common/webplugininfo.h"
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 13 matching lines @@
     { "10,0,45,2", "10.0.45.2" },      // Flash
     { "10.1 r102", "10.1.102"},        // Flash
     { "10.3 d180", "10.3.180" },       // Flash (Debug)
     { "11.5.7r609", "11.5.7.609"},     // Shockwave
     { "1.6.0_22", "1.6.0.22"},         // Java
     { "1.07.00_0005", "1.7.0.5"},      // Java with leading zeros
     { "1..0", "1.0.0" }                // Empty version component
   };
 
   for (size_t i = 0; i < arraysize(versions); i++) {
-    base::Version version;
+    Version version;
     WebPluginInfo::CreateVersionFromString(
         base::ASCIIToUTF16(versions[i][0]), &version);
 
     ASSERT_TRUE(version.IsValid());
     EXPECT_EQ(versions[i][1], version.GetString());
   }
 }
 
 }  // namespace content