Remove some usage of the ENABLE_GPU macro.

content/common/gpu/image_transport_surface.cc

Index: content/common/gpu/image_transport_surface.cc
===================================================================
--- content/common/gpu/image_transport_surface.cc	(revision 174988)
+++ content/common/gpu/image_transport_surface.cc	(working copy)
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#if defined(ENABLE_GPU)
-
 #include "content/common/gpu/image_transport_surface.h"
 
 #include "base/bind.h"
@@ -337,5 +335,3 @@
 }
 
 }  // namespace content
-
-#endif  // defined(ENABLE_GPU)