Remove some usage of the ENABLE_GPU macro.

content/common/gpu/gpu_memory_tracking.cc

 // 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.
 
 #include "content/common/gpu/gpu_memory_tracking.h"
 
-#if defined(ENABLE_GPU)
-
 #include "content/common/gpu/gpu_memory_manager.h"
 
 namespace content {
 
 GpuMemoryTrackingGroup::GpuMemoryTrackingGroup(
     base::ProcessId pid,
     gpu::gles2::MemoryTracker* memory_tracker,
     GpuMemoryManager* memory_manager)
     : pid_(pid),
       size_(0),
       hibernated_(false),
       memory_tracker_(memory_tracker),
       memory_manager_(memory_manager) {
 }
 
 GpuMemoryTrackingGroup::~GpuMemoryTrackingGroup() {
   memory_manager_->OnDestroyTrackingGroup(this);
 }
 
 void GpuMemoryTrackingGroup::TrackMemoryAllocatedChange(
     size_t old_size,
     size_t new_size,
     gpu::gles2::MemoryTracker::Pool tracking_pool) {
   memory_manager_->TrackMemoryAllocatedChange(
       this, old_size, new_size, tracking_pool);
 }
 
 }  // namespace content
-
-#endif