Change notification cmd line enabling to use the new RuntimeEnabledFeatures code.

BUG=25318
TEST=none

Review URL: http://codereview.chromium.org/339093

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@30660 0039d316-1c4b-4281-b951-d872f2087c98
void RenderThread::AddFilter(IPC::ChannelProxy::MessageFilter* filter) {
  channel()->AddFilter(filter);
}

void RenderThread::AddFilter(IPC::ChannelProxy::MessageFilter* filter) {
  channel()->AddFilter(filter);
}
