Remove PeerConnectionIdentityStore and related messaging/storage code.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index a43b39dd21d59a1de6dff1ddc1efd61596b5d7b4..7e08ad9670a4c359f6c21b86b1ce5082390cb19b 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -191,7 +191,6 @@
 #include "content/renderer/media/peer_connection_tracker.h"
 #include "content/renderer/media/rtc_peer_connection_handler.h"
 #include "content/renderer/media/webrtc/peer_connection_dependency_factory.h"
-#include "content/renderer/media/webrtc_identity_service.h"
 #endif
 
 #ifdef ENABLE_VTUNE_JIT_INTERFACE
@@ -689,8 +688,6 @@ void RenderThreadImpl::Init(
       new P2PSocketDispatcher(GetIOMessageLoopProxy().get());
   AddFilter(p2p_socket_dispatcher_.get());
 
-  webrtc_identity_service_.reset(new WebRTCIdentityService());
-
   peer_connection_factory_.reset(
       new PeerConnectionDependencyFactory(p2p_socket_dispatcher_.get()));