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

content/public/test/mock_render_process_host.cc

Index: content/public/test/mock_render_process_host.cc
diff --git a/content/public/test/mock_render_process_host.cc b/content/public/test/mock_render_process_host.cc
index 451eefe2e821da013bce47d2fa775eeb777027d8..02394e8605ab5dc8ea9430c17cbd752a523ab2e4 100644
--- a/content/public/test/mock_render_process_host.cc
+++ b/content/public/test/mock_render_process_host.cc
@@ -242,15 +242,7 @@ bool MockRenderProcessHost::InSameStoragePartition(
 }
 
 IPC::ChannelProxy* MockRenderProcessHost::GetChannel() {
-  return nullptr;
-}
-
-IPC::Sender* MockRenderProcessHost::GetImmediateSender() {
-  return this;
-}
-
-IPC::Sender* MockRenderProcessHost::GetIOThreadSender() {
-  return this;
+  return NULL;
 }
 
 void MockRenderProcessHost::AddFilter(BrowserMessageFilter* filter) {