Revert of Version of MessagePumpForUI optimized for GPU process

base/message_loop/message_loop_unittest.cc

Index: base/message_loop/message_loop_unittest.cc
diff --git a/base/message_loop/message_loop_unittest.cc b/base/message_loop/message_loop_unittest.cc
index da7cad01077928b3a4f1d6d5e82306498b01e1c0..e0e46e2202456c0b39725e59811d8cdc08eeed31 100644
--- a/base/message_loop/message_loop_unittest.cc
+++ b/base/message_loop/message_loop_unittest.cc
@@ -583,9 +583,6 @@
 RUN_MESSAGE_LOOP_TESTS(IO, &TypeIOMessagePumpFactory);
 
 #if defined(OS_WIN)
-// Additional set of tests for GPU version of UI message loop.
-RUN_MESSAGE_LOOP_TESTS(GPU, &MessagePumpForGpu::CreateMessagePumpForGpu);
-
 TEST(MessageLoopTest, PostDelayedTask_SharedTimer_SubPump) {
   RunTest_PostDelayedTask_SharedTimer_SubPump();
 }