Move GPU device/driver info related code from content to gpu.

gpu/config/dx_diag_node.h

 // Copyright (c) 2010 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.
 //
 // A tree of name value pairs that report contain DirectX diagnostic
 // information.
 
-#ifndef CONTENT_PUBLIC_COMMON_DX_DIAG_NODE_H_
-#define CONTENT_PUBLIC_COMMON_DX_DIAG_NODE_H_
+#ifndef GPU_CONFIG_DX_DIAG_NODE_H_
+#define GPU_CONFIG_DX_DIAG_NODE_H_
 
 #include <map>
 #include <string>
 
-namespace content {
+#include "gpu/gpu_export.h"
 
-struct DxDiagNode {
+namespace gpu {
+
+struct GPU_EXPORT DxDiagNode {
   DxDiagNode();
   ~DxDiagNode();
   std::map<std::string, std::string> values;
   std::map<std::string, DxDiagNode> children;
 };
 
-}  // namespace content
+}  // namespace gpu
 
-#endif  // CONTENT_PUBLIC_COMMON_DX_DIAG_NODE_H_
+#endif  // GPU_CONFIG_DX_DIAG_NODE_H_