PPAPI: Make PPB_MessageLoop_Dev::GetForMainThread work

ppapi/cpp/dev/message_loop_dev.h

Index: ppapi/cpp/dev/message_loop_dev.h
diff --git a/ppapi/cpp/dev/message_loop_dev.h b/ppapi/cpp/dev/message_loop_dev.h
index 11f1dfaced2f55758b306d269ac13f6d67cc5082..b3aebab3cacecf8206d862a927a5b9e7de146f40 100644
--- a/ppapi/cpp/dev/message_loop_dev.h
+++ b/ppapi/cpp/dev/message_loop_dev.h
@@ -107,7 +107,7 @@ class InstanceHandle;
 /// to run until all pending tasks are run.
 ///
 /// If you post a callback to a message loop that's been destroyed, or to an
-/// invalid message loop, PostTask will return an error and will not run the
+/// invalid message loop, PostWork will return an error and will not run the
 /// callback. This is true even for callbacks with the "required" flag set,
 /// since the system may not even know what thread to issue the error callback
 /// on.