gpu: Remove unused GpuChildThread::gpu_preferences_.

content/gpu/in_process_gpu_thread.cc

 // Copyright 2013 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/gpu/in_process_gpu_thread.h"
 
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "content/gpu/gpu_child_thread.h"
 #include "content/gpu/gpu_process.h"
@@ skipping 32 matching lines @@
   // will not change the thread name kept in Java VM.
   base::android::AttachCurrentThreadWithName(thread_name());
   // Up the priority of the |io_thread_| on Android.
   io_thread_priority = base::ThreadPriority::DISPLAY;
 #endif
 
   gpu_process_ = new GpuProcess(io_thread_priority);
 
   // The process object takes ownership of the thread object, so do not
   // save and delete the pointer.
-  GpuChildThread* child_thread = new GpuChildThread(
-      gpu_preferences_, params_, gpu_memory_buffer_factory_.get());
+  GpuChildThread* child_thread =
+      new GpuChildThread(params_, gpu_memory_buffer_factory_.get());
 
   // Since we are in the browser process, use the thread start time as the
   // process start time.
   child_thread->Init(base::Time::Now());
 
   gpu_process_->set_main_thread(child_thread);
 }
 
 void InProcessGpuThread::CleanUp() {
   SetThreadWasQuitProperly(true);
   delete gpu_process_;
 }
 
 base::Thread* CreateInProcessGpuThread(
     const InProcessChildThreadParams& params,
     const gpu::GpuPreferences& gpu_preferences) {
   return new InProcessGpuThread(params, gpu_preferences);
 }
 
 }  // namespace content