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

gpu/config/gpu_info.h

 // 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.
 
 #ifndef GPU_CONFIG_GPU_INFO_H_
 #define GPU_CONFIG_GPU_INFO_H_
 
 // Provides access to the GPU information for the system
 // on which chrome is currently running.
 
@@ skipping 101 matching lines @@
   bool optimus;
 
   // Computer has AMD Dynamic Switchable Graphics
   bool amd_switchable;
 
   // Lenovo dCute is installed. http://crbug.com/181665.
   bool lenovo_dcute;
 
   // Version of DisplayLink driver installed. Zero if not installed.
   // http://crbug.com/177611.
-  base::Version display_link_version;
+  Version display_link_version;
 
   // Primary GPU, for exmaple, the discrete GPU in a dual GPU machine.
   GPUDevice gpu;
 
   // Secondary GPUs, for example, the integrated GPU in a dual GPU machine.
   std::vector<GPUDevice> secondary_gpus;
 
   // On Windows, the unique identifier of the adapter the GPU process uses.
   // The default is zero, which makes the browser process create its D3D device
   // on the primary adapter. Note that the primary adapter can change at any
@@ skipping 136 matching lines @@
     virtual ~Enumerator() {}
   };
 
   // Outputs the fields in this structure to the provided enumerator.
   void EnumerateFields(Enumerator* enumerator) const;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_CONFIG_GPU_INFO_H_