Fixed compile error for unit-tests on linux. We do not include any glew file ...

gpu/command_buffer/service/x_utils.h

 // Copyright (c) 2009 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.
 
 // This file declares the XWindowWrapper class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_X_UTILS_H_
 #define GPU_COMMAND_BUFFER_SERVICE_X_UTILS_H_
 
-#include <GL/glxew.h>
 #include "base/basictypes.h"
 #include "gpu/command_buffer/common/logging.h"
+#include "gpu/command_buffer/service/gl_utils.h"
 
 namespace gpu {
 
 // This class is a wrapper around an X Window and associated GL context. It is
 // useful to isolate intrusive X headers, since it can be forward declared
 // (Window and GLXContext can't).
 class XWindowWrapper {
  public:
   XWindowWrapper(Display *display, Window window)
       : display_(display),
@@ skipping 16 matching lines @@
  private:
   Display *display_;
   Window window_;
   GLXContext context_;
   DISALLOW_COPY_AND_ASSIGN(XWindowWrapper);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_X_UTILS_H_