Revert changes to GPU test MessageLoop type.

gpu/command_buffer/service/gpu_service_test.cc

Index: gpu/command_buffer/service/gpu_service_test.cc
diff --git a/gpu/command_buffer/service/gpu_service_test.cc b/gpu/command_buffer/service/gpu_service_test.cc
index f4e38dcfdfd1625eca397e7b47c1b57d17adc9d3..8e2d198585b863d4bbb4a3712bfb97a8dd911bf2 100644
--- a/gpu/command_buffer/service/gpu_service_test.cc
+++ b/gpu/command_buffer/service/gpu_service_test.cc
@@ -5,7 +5,6 @@
 #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"
@@ -17,10 +16,7 @@
 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_);