This CL makes the following replacements everywhere:

Before               After
----------------------------------------------------------
 x.PostTask()          x.task_runner()->PostTask()
   PostDelayedTask()                    PostDelayedTask()
   ReleaseSoon()                        ReleaseSoon()
   DeleteSoon()                         DeleteSoon()

x->PostTask()         y->task_runner()->PostTask()
   PostDelayedTask()                    PostDelayedTask()
   ReleaseSoon()                        ReleaseSoon()
   DeleteSoon()                         DeleteSoon()

 x.Run()              RunLoop().Run()
 x.RunUntilIdle()     RunLoop().RunUntilIdle()

x->Run()              RunLoop().Run()
x->RunUntilIdle()     RunLoop().RunUntilIdle()
    If |x| isn't MessageLoopForUI::current() or
    MessageLoopForIO::current()
----------------------------------------------------------

|x| is a base::MessageLoop(ForUI|ForIO) or a pointer to
a base::MessageLoop(ForUI|ForIO).

This CL was generated using the MessageLoopDeprecatedMethods
clang-tidy fix available on the associated bug. Only files
that compile on Mac are affected. Follow-up CLs will make
these replacements for other platforms.

This CL doesn't change code behavior.

TBR=garykac@chromium.org
BUG=616447

Review-Url: https://codereview.chromium.org/2104363004
Cr-Commit-Position: refs/heads/master@{#403716}