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

content/browser/gpu/gpu_data_manager_impl_private.cc

 // Copyright (c) 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 "content/browser/gpu/gpu_data_manager_impl_private.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 58 matching lines @@
 };
 
 int GetGpuBlacklistHistogramValueWin(GpuFeatureStatus status) {
   static WinSubVersion sub_version = kNumWinSubVersions;
   if (sub_version == kNumWinSubVersions) {
     sub_version = kWinOthers;
     std::string version_str = base::SysInfo::OperatingSystemVersion();
     size_t pos = version_str.find_first_not_of("0123456789.");
     if (pos != std::string::npos)
       version_str = version_str.substr(0, pos);
-    base::Version os_version(version_str);
+    Version os_version(version_str);
     if (os_version.IsValid() && os_version.components().size() >= 2) {
       const std::vector<uint32_t>& version_numbers = os_version.components();
       if (version_numbers[0] == 5)
         sub_version = kWinXP;
       else if (version_numbers[0] == 6 && version_numbers[1] == 0)
         sub_version = kWinVista;
       else if (version_numbers[0] == 6 && version_numbers[1] == 1)
         sub_version = kWin7;
       else if (version_numbers[0] == 6 && version_numbers[1] == 2)
         sub_version = kWin8;
@@ skipping 1115 matching lines @@
   gpu_info_.context_info_state = gpu::kCollectInfoFatalFailure;
 #if defined(OS_WIN)
   gpu_info_.dx_diagnostics_info_state = gpu::kCollectInfoFatalFailure;
 #endif
   complete_gpu_info_already_requested_ = true;
   // Some observers might be waiting.
   NotifyGpuInfoUpdate();
 }
 
 }  // namespace content