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

chrome/renderer/media/chrome_key_systems.cc

 // Copyright 2013 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/renderer/media/chrome_key_systems.h"
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 130 matching lines @@
           codecs_string, std::string(1, kCdmSupportedCodecsValueDelimiter),
           base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
       break;
     }
   }
 }
 
 static void AddPepperBasedWidevine(
     std::vector<KeySystemInfo>* concrete_key_systems) {
 #if defined(WIDEVINE_CDM_MIN_GLIBC_VERSION)
-  base::Version glibc_version(gnu_get_libc_version());
+  Version glibc_version(gnu_get_libc_version());
   DCHECK(glibc_version.IsValid());
   if (glibc_version.IsOlderThan(WIDEVINE_CDM_MIN_GLIBC_VERSION))
     return;
 #endif  // defined(WIDEVINE_CDM_MIN_GLIBC_VERSION)
 
   std::vector<base::string16> additional_param_names;
   std::vector<base::string16> additional_param_values;
   if (!IsPepperCdmAvailable(kWidevineCdmPluginMimeType,
                             &additional_param_names,
                             &additional_param_values)) {
@@ skipping 59 matching lines @@
 
 #if defined(WIDEVINE_CDM_AVAILABLE)
   AddPepperBasedWidevine(key_systems_info);
 #endif  // defined(WIDEVINE_CDM_AVAILABLE)
 #endif  // defined(ENABLE_PEPPER_CDMS)
 
 #if defined(OS_ANDROID)
   cdm::AddAndroidWidevine(key_systems_info);
 #endif  // defined(OS_ANDROID)
 }