QUIC - Temporary fix for b/20760730 until channel_id_service is

supported in cronet to fix a crash bug in cronet.

BUG=487355
R=mef@chromium.org, rch@chromium.org

Review URL: https://codereview.chromium.org/1138943002

Cr-Commit-Position: refs/heads/master@{#329494}

net/quic/quic_stream_factory.cc

@@ -578,8 +578,12 @@ QuicStreamFactory::QuicStreamFactory(
   crypto_config_.AddCanonicalSuffix(".googlevideo.com");
   crypto_config_.SetProofVerifier(
       new ProofVerifierChromium(cert_verifier, transport_security_state));
-  crypto_config_.SetChannelIDSource(
-      new ChannelIDSourceChromium(channel_id_service));
+  // TODO(rtenneti): http://crbug.com/487355. Temporary fix for b/20760730 until
+  // channel_id_service is supported in cronet.
+  if (channel_id_service) {
+    crypto_config_.SetChannelIDSource(
+        new ChannelIDSourceChromium(channel_id_service));
+  }
   base::CPU cpu;
   if (cpu.has_aesni() && cpu.has_avx())
     crypto_config_.PreferAesGcm();