Fix leak when a PeerConnection offer or answer is created.

content/renderer/media/rtc_peer_connection_handler.cc

Index: content/renderer/media/rtc_peer_connection_handler.cc
diff --git a/content/renderer/media/rtc_peer_connection_handler.cc b/content/renderer/media/rtc_peer_connection_handler.cc
index 0c5c3737cf153f2ca680d981e502701bb4301220..d869ccc954ae3dbcb04fe1f7ff58a51fff235a24 100644
--- a/content/renderer/media/rtc_peer_connection_handler.cc
+++ b/content/renderer/media/rtc_peer_connection_handler.cc
@@ -186,6 +186,7 @@ class CreateSessionDescriptionRequest
   virtual void OnSuccess(webrtc::SessionDescriptionInterface* desc) OVERRIDE {
     tracker_.TrackOnSuccess(desc);
     webkit_request_.requestSucceeded(CreateWebKitSessionDescription(desc));
+    delete desc;
   }
   virtual void OnFailure(const std::string& error) OVERRIDE {
     tracker_.TrackOnFailure(error);