Remove the ENABLE_GPU #define and enable_gpu gyp variable

content/renderer/pepper/pepper_platform_context_3d.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 CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_CONTEXT_3D_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_CONTEXT_3D_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
 #include "gpu/command_buffer/common/mailbox.h"
 
-#ifdef ENABLE_GPU
-
 class CommandBufferProxy;
 namespace gpu {
 class CommandBuffer;
 struct Mailbox;
 }  // namespace gpu
 
 namespace content {
 class ContextProviderCommandBuffer;
 class GpuChannelHost;
 
@@ skipping 45 matching lines @@
   gpu::Mailbox mailbox_;
   bool has_alpha_;
   CommandBufferProxyImpl* command_buffer_;
   base::Closure context_lost_callback_;
   ConsoleMessageCallback console_message_callback_;
   base::WeakPtrFactory<PlatformContext3D> weak_ptr_factory_;
 };
 
 }  // namespace content
 
-#endif  // ENABLE_GPU
-
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_CONTEXT_3D_H_