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_fuzzing_tests.cc b/ipc/ipc_fuzzing_tests.cc
index f197a6b..373b2a7 100644
--- a/ipc/ipc_fuzzing_tests.cc
+++ b/ipc/ipc_fuzzing_tests.cc

@@ -11,6 +11,7 @@
 #include <string>
 
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/platform_thread.h"
@@ -244,7 +245,7 @@
 
  private:
   bool MsgHandlerInternal(uint32_t type_id) {
-    base::MessageLoop::current()->Run();
+    base::RunLoop().Run();
     if (NULL == last_msg_)
       return false;
     if (FUZZER_ROUTING_ID != last_msg_->routing_id())
@@ -264,7 +265,7 @@
       IPCTestBase::GetChannelName("FuzzServerClient"), &listener));
   CHECK(channel->Connect());
   listener.Init(channel.get());
-  base::MessageLoop::current()->Run();
+  base::RunLoop().Run();
   return 0;
 }