Replace "nested message loop" with "nested run loop" in comments.

ipc/ipc_sync_channel.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ipc/ipc_sync_channel.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
@@ skipping 656 matching lines @@
 
     if (dispatch) {
       // We're waiting for a reply, but we received a blocking synchronous call.
       // We must process it to avoid potential deadlocks.
       context->GetDispatchEvent()->Reset();
       context->DispatchMessages();
       continue;
     }
 
     if (should_pump_messages)
-      WaitForReplyWithNestedMessageLoop(context);  // Run a nested message loop.
+      WaitForReplyWithNestedMessageLoop(context);  // Run a nested run loop.
 
     break;
   }
 }
 
 void SyncChannel::WaitForReplyWithNestedMessageLoop(SyncContext* context) {
   base::MessageLoop::ScopedNestableTaskAllower allow(
       base::MessageLoop::current());
   base::RunLoop nested_loop;
   ReceivedSyncMsgQueue::NestedSendDoneWatcher watcher(context, &nested_loop);
@@ skipping 19 matching lines @@
       sync_context()->GetDispatchEvent(),
       base::Bind(&SyncChannel::OnDispatchEventSignaled,
                  base::Unretained(this)));
 }
 
 void SyncChannel::OnChannelInit() {
   pre_init_sync_message_filters_.clear();
 }
 
 }  // namespace IPC