Disable SPDY pooling

Bug: 16799113

The original patch is
https://codereview.chromium.org/417013005
We only take the SPDY part since Quic is not enabled.

Change-Id: Ie25ab23b1984d1e87e6019df0224fe8d7f388828
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0