Revert of Verify if GPU message pump is signaled when it hangs in WaitForWork

base/message_loop/message_loop.cc

Index: base/message_loop/message_loop.cc
diff --git a/base/message_loop/message_loop.cc b/base/message_loop/message_loop.cc
index 9d3769169cf4926375118daa7f50574b97b9d2b6..2d6e2a5bf5668d62743780641638a12ebcd591d7 100644
--- a/base/message_loop/message_loop.cc
+++ b/base/message_loop/message_loop.cc
@@ -564,12 +564,6 @@
   pump_->ScheduleWork();
 }
 
-#if defined(OS_WIN)
-bool MessageLoop::MessagePumpWasSignaled() {
-  return pump_->WasSignaled();
-}
-#endif
-
 //------------------------------------------------------------------------------
 // Method and data for histogramming events and actions taken by each instance
 // on each thread.