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

gpu/config/dx_diag_node.cc

Index: gpu/config/dx_diag_node.cc
===================================================================
--- gpu/config/dx_diag_node.cc	(revision 0)
+++ gpu/config/dx_diag_node.cc	(working copy)
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/public/common/dx_diag_node.h"
+#include "gpu/config/dx_diag_node.h"
 
-namespace content {
+namespace gpu {
 
 DxDiagNode::DxDiagNode() {}
 
 DxDiagNode::~DxDiagNode() {}
 
-}  // namespace content
+}  // namespace gpu