Remove EventWrapper::Reset().

This simplifies the event wrapper which we've recently found issues in.
Also refactoring EndToEndTest.RespectsNetworkState to not depend on it.

BUG=
R=stefan@webrtc.org, tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/41939004

Cr-Commit-Position: refs/heads/master@{#8366}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8366 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_coding/main/source/receiver.cc

@@ -49,7 +49,6 @@ void VCMReceiver::Reset() {
   } else {
     jitter_buffer_.Flush();
   }
-  render_wait_event_->Reset();
   state_ = kReceiving;
 }