Bailing out if pc factory fails to get created.

This prevents us from continuing if we fail initialization.
The failure will happen closer to its source, rather than
when we try to create the first peer connection.

BUG=None
R=glaznev@webrtc.org

Review URL: https://codereview.webrtc.org/1339923004 .

Cr-Commit-Position: refs/heads/master@{#9948}

talk/app/webrtc/java/jni/peerconnection_jni.cc

@@ -1103,6 +1103,8 @@ JOW(jlong, PeerConnectionFactory_nativeCreatePeerConnectionFactory)(
                                           NULL,
                                           encoder_factory,
                                           decoder_factory));
+  CHECK(factory) << "Failed to create the peer connection factory; "
+                 << "WebRTC/libjingle init likely failed on this device";
   OwnedFactoryAndThreads* owned_factory = new OwnedFactoryAndThreads(
       worker_thread, signaling_thread,
       encoder_factory, decoder_factory,