Revert changes to GPU test MessageLoop type.

gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
index 9ea3f76189a9acbc36074d3ca49dc3ac38a4754e..2187f4961f84c9aeb6d366bfcf033b22f6d34dcb 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
@@ -23,7 +23,6 @@
 #include "gpu/command_buffer/service/program_manager.h"
 #include "gpu/command_buffer/service/test_helper.h"
 #include "gpu/command_buffer/service/vertex_attrib_manager.h"
-#include "gpu/test_message_loop_type.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gl/gl_mock.h"
 #include "ui/gl/init/gl_factory.h"
@@ -124,8 +123,7 @@ GLES2DecoderTestBase::GLES2DecoderTestBase()
       cached_depth_mask_(true),
       cached_stencil_front_mask_(static_cast<GLuint>(-1)),
       cached_stencil_back_mask_(static_cast<GLuint>(-1)),
-      shader_language_version_(100),
-      message_loop_(test::GetMessageLoopTypeForGpu()) {
+      shader_language_version_(100) {
   memset(immediate_buffer_, 0xEE, sizeof(immediate_buffer_));
 }