Revert of Remove candidates when doing continual gathering

webrtc/p2p/base/dtlstransportchannel.cc

Index: webrtc/p2p/base/dtlstransportchannel.cc
diff --git a/webrtc/p2p/base/dtlstransportchannel.cc b/webrtc/p2p/base/dtlstransportchannel.cc
index bbf3e5c484b0302672ea889665ec4ec0ac285134..2185fb3aad7eb1d4947a36e64bdfe44367007246 100644
--- a/webrtc/p2p/base/dtlstransportchannel.cc
+++ b/webrtc/p2p/base/dtlstransportchannel.cc
@@ -113,8 +113,6 @@
       this, &DtlsTransportChannelWrapper::OnGatheringState);
   channel_->SignalCandidateGathered.connect(
       this, &DtlsTransportChannelWrapper::OnCandidateGathered);
-  channel_->SignalCandidatesRemoved.connect(
-      this, &DtlsTransportChannelWrapper::OnCandidatesRemoved);
   channel_->SignalRoleConflict.connect(this,
       &DtlsTransportChannelWrapper::OnRoleConflict);
   channel_->SignalRouteChange.connect(this,
@@ -615,13 +613,6 @@
   SignalCandidateGathered(this, c);
 }
 
-void DtlsTransportChannelWrapper::OnCandidatesRemoved(
-    TransportChannelImpl* channel,
-    const Candidates& candidates) {
-  ASSERT(channel == channel_);
-  SignalCandidatesRemoved(this, candidates);
-}
-
 void DtlsTransportChannelWrapper::OnRoleConflict(
     TransportChannelImpl* channel) {
   ASSERT(channel == channel_);