Remove remaining calls to deprecated MessageLoop methods.

ipc/ipc_sync_channel.cc

Index: ipc/ipc_sync_channel.cc
diff --git a/ipc/ipc_sync_channel.cc b/ipc/ipc_sync_channel.cc
index 8e3f4115b5a5c8426c13edc583389b57faeb822b..fe2b61b193ef3bab906c8a7e36a86d4b1c259a35 100644
--- a/ipc/ipc_sync_channel.cc
+++ b/ipc/ipc_sync_channel.cc
@@ -14,6 +14,7 @@
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
+#include "base/run_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/synchronization/waitable_event_watcher.h"
 #include "base/threading/thread_local.h"
@@ -566,7 +567,7 @@ void SyncChannel::WaitForReplyWithNestedMessageLoop(SyncContext* context) {
   {
     base::MessageLoop::ScopedNestableTaskAllower allow(
         base::MessageLoop::current());
-    base::MessageLoop::current()->Run();
+    base::RunLoop().Run();
   }
 
   sync_msg_queue->set_top_send_done_watcher(old_send_done_event_watcher);