Revert "Send input event IPCs directly from the UI thread"

ipc/ipc_sync_message_filter.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_message_filter.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 17 matching lines @@
   *signal = true;
   *error = result != MOJO_RESULT_OK;
 }
 
 }  // namespace
 
 bool SyncMessageFilter::Send(Message* message) {
   if (!message->is_sync()) {
     {
       base::AutoLock auto_lock(lock_);
-      if (!io_task_runner_.get()) {
+      if (sender_ && is_channel_send_thread_safe_) {
+        sender_->Send(message);
+        return true;
+      } else if (!io_task_runner_.get()) {
         pending_messages_.emplace_back(base::WrapUnique(message));
         return true;
       }
     }
     io_task_runner_->PostTask(
         FROM_HERE,
         base::Bind(&SyncMessageFilter::SendOnIOThread, this, message));
     return true;
   }
 
@@ skipping 97 matching lines @@
                               "SyncMessageFilter::OnMessageReceived",
                               (*iter)->done_event);
       (*iter)->done_event->Signal();
       return true;
     }
   }
 
   return false;
 }
 
-bool SyncMessageFilter::SendNow(std::unique_ptr<Message> message) {
-  if (!message->is_sync()) {
-    base::AutoLock auto_lock(lock_);
-    if (sender_ && is_channel_send_thread_safe_) {
-      sender_->Send(message.release());
-      return true;
-    }
-  }
-
-  // Fall back on default Send behavior.
-  return Send(message.release());
-}
-
 SyncMessageFilter::SyncMessageFilter(base::WaitableEvent* shutdown_event,
                                      bool is_channel_send_thread_safe)
     : sender_(NULL),
       is_channel_send_thread_safe_(is_channel_send_thread_safe),
       listener_task_runner_(base::ThreadTaskRunnerHandle::Get()),
       shutdown_event_(shutdown_event) {
 }
 
 SyncMessageFilter::~SyncMessageFilter() {
 }
@@ skipping 24 matching lines @@
     (*iter)->done_event->Signal();
   }
 }
 
 void SyncMessageFilter::OnShutdownEventSignaled(base::WaitableEvent* event) {
   DCHECK_EQ(event, shutdown_event_);
   shutdown_mojo_event_.Signal();
 }
 
 }  // namespace IPC