Revert of Remove GetTransport() from TransportChannelImpl

webrtc/p2p/base/faketransportcontroller.h

Index: webrtc/p2p/base/faketransportcontroller.h
diff --git a/webrtc/p2p/base/faketransportcontroller.h b/webrtc/p2p/base/faketransportcontroller.h
index 82f4ebdc7b1d24c31169afb1f5e4364508726f60..65c59be98d0ee93777f6454e8742ded125caf5b1 100644
--- a/webrtc/p2p/base/faketransportcontroller.h
+++ b/webrtc/p2p/base/faketransportcontroller.h
@@ -45,9 +45,11 @@
 class FakeTransportChannel : public TransportChannelImpl,
                              public rtc::MessageHandler {
  public:
-  explicit FakeTransportChannel(const std::string& name,
+  explicit FakeTransportChannel(Transport* transport,
+                                const std::string& name,
                                 int component)
       : TransportChannelImpl(name, component),
+        transport_(transport),
         dtls_fingerprint_("", nullptr, 0) {}
   ~FakeTransportChannel() { Reset(); }
 
@@ -64,6 +66,8 @@
   // If async, will send packets by "Post"-ing to message queue instead of
   // synchronously "Send"-ing.
   void SetAsync(bool async) { async_ = async; }
+
+  Transport* GetTransport() override { return transport_; }
 
   TransportChannelState GetState() const override {
     if (connection_count_ == 0) {
@@ -309,6 +313,7 @@
 
  private:
   enum State { STATE_INIT, STATE_CONNECTING, STATE_CONNECTED };
+  Transport* transport_;
   FakeTransportChannel* dest_ = nullptr;
   State state_ = STATE_INIT;
   bool async_ = false;
@@ -410,7 +415,7 @@
       return nullptr;
     }
     FakeTransportChannel* channel =
-        new FakeTransportChannel(name(), component);
+        new FakeTransportChannel(this, name(), component);
     channel->set_ssl_max_protocol_version(ssl_max_version_);
     channel->SetAsync(async_);
     SetChannelDestination(component, channel);