Cherry-pick: Block media loading when AwSettings.setBlockNetworkLoads is true.

Cherry-pick of Chromium
https://codereview.chromium.org/52463004/

BUG:11139117

Original description:
Prevent media from being loading from network when AwSettings.setBlockNetworkLoads is true.

Change-Id: I3c7b3d58ce9e01f5952d3c76749deb38ce3e5e1d
9 files changed