Reland of Adding the ability to change ICE servers through SetConfiguration.

talk/app/webrtc/peerconnection.h

Index: talk/app/webrtc/peerconnection.h
diff --git a/talk/app/webrtc/peerconnection.h b/talk/app/webrtc/peerconnection.h
index 2d388ae9f913912990af0541dd8eae67008da745..21e69fc9e5d554a72a5881af41a36fbb4c729de6 100644
--- a/talk/app/webrtc/peerconnection.h
+++ b/talk/app/webrtc/peerconnection.h
@@ -75,12 +75,22 @@ class PeerConnection : public PeerConnectionInterface,
  public:
   explicit PeerConnection(PeerConnectionFactory* factory);
 
+  // TODO(deadbeef): Remove this overload of Initialize once everyone is moved
+  // to the new version.
   bool Initialize(
       const PeerConnectionInterface::RTCConfiguration& configuration,
       const MediaConstraintsInterface* constraints,
       PortAllocatorFactoryInterface* allocator_factory,
       rtc::scoped_ptr<DtlsIdentityStoreInterface> dtls_identity_store,
       PeerConnectionObserver* observer);
+
+  bool Initialize(
+      const PeerConnectionInterface::RTCConfiguration& configuration,
+      const MediaConstraintsInterface* constraints,
+      rtc::scoped_ptr<cricket::PortAllocator> allocator,
+      rtc::scoped_ptr<DtlsIdentityStoreInterface> dtls_identity_store,
+      PeerConnectionObserver* observer);
+
   rtc::scoped_refptr<StreamCollectionInterface> local_streams() override;
   rtc::scoped_refptr<StreamCollectionInterface> remote_streams() override;
   bool AddStream(MediaStreamInterface* local_stream) override;