Remove calls to deprecated MessageLoop methods in ipc.

This CL makes the following replacements in
ipc:

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 |y| isn't MessageLoopForUI::current() or
    MessageLoopForIO::current()

 y.message_loop()->task_runner()
                      y.task_runner()
y->message_loop()->task_runner()
                      y->task_runner()
----------------------------------------------------------

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

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.

BUG=616447
R=jam@chromium.org

Review-Url: https://codereview.chromium.org/2087163003
Cr-Commit-Position: refs/heads/master@{#401385}

diff --git a/ipc/ipc_send_fds_test.cc b/ipc/ipc_send_fds_test.cc
index 3b0e7b3..a656015 100644
--- a/ipc/ipc_send_fds_test.cc
+++ b/ipc/ipc_send_fds_test.cc

@@ -24,6 +24,7 @@
 #include "base/location.h"
 #include "base/pickle.h"
 #include "base/posix/eintr_wrapper.h"
+#include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/waitable_event.h"
 #include "ipc/ipc_message_attachment_set.h"
@@ -133,7 +134,7 @@
     }
 
     // Run message loop.
-    base::MessageLoop::current()->Run();
+    base::RunLoop().Run();
 
     // Close the channel so the client's OnChannelError() gets fired.
     channel()->Close();
@@ -159,7 +160,7 @@
   CHECK(channel->Connect());
 
   // Run message loop.
-  base::MessageLoop::current()->Run();
+  base::RunLoop().Run();
 
   // Verify that the message loop was exited due to getting the correct number
   // of descriptors, and not because of the channel closing unexpectedly.