Mojoify PoweMonitorMessageBroadcaster IPC from browser to child process

content/child/child_thread_impl.cc

Index: content/child/child_thread_impl.cc
diff --git a/content/child/child_thread_impl.cc b/content/child/child_thread_impl.cc
index dca6c148fd0099de922908aa3806598dc86c3e92..8cd4f524326e5182e999e7e0ac34761c1e8a23ac 100644
--- a/content/child/child_thread_impl.cc
+++ b/content/child/child_thread_impl.cc
@@ -513,8 +513,6 @@ void ChildThreadImpl::Init(const Options& options) {
   if (!base::PowerMonitor::Get()) {
     std::unique_ptr<PowerMonitorBroadcastSource> power_monitor_source(
         new PowerMonitorBroadcastSource());
-    channel_->AddFilter(power_monitor_source->GetMessageFilter());
-
     power_monitor_.reset(
         new base::PowerMonitor(std::move(power_monitor_source)));
   }