Revert changes to GPU test MessageLoop type.

gpu/command_buffer/service/gpu_service_test.cc

 // Copyright 2014 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 "gpu/command_buffer/service/gpu_service_test.h"
 
 #include "gpu/command_buffer/service/test_helper.h"
-#include "gpu/test_message_loop_type.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gl/gl_context_stub.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_mock.h"
 #include "ui/gl/gl_surface_stub.h"
 #include "ui/gl/init/gl_factory.h"
 #include "ui/gl/test/gl_surface_test_support.h"
 
 namespace gpu {
 namespace gles2 {
 
-GpuServiceTest::GpuServiceTest()
-    : ran_setup_(false),
-      ran_teardown_(false),
-      message_loop_(test::GetMessageLoopTypeForGpu()) {}
+GpuServiceTest::GpuServiceTest() : ran_setup_(false), ran_teardown_(false) {}
 
 GpuServiceTest::~GpuServiceTest() {
   DCHECK(ran_teardown_);
 }
 
 void GpuServiceTest::SetUpWithGLVersion(const char* gl_version,
                                         const char* gl_extensions) {
   testing::Test::SetUp();
 
   gl::SetGLGetProcAddressProc(gl::MockGLInterface::GetGLProcAddress);
@@ skipping 28 matching lines @@
 gl::GLContext* GpuServiceTest::GetGLContext() {
   return context_.get();
 }
 
 gl::GLSurface* GpuServiceTest::GetGLSurface() {
   return surface_.get();
 }
 
 }  // namespace gles2
 }  // namespace gpu