Switch webservd to binder in Android

This should fix chromeos building as a side effect, as we're not
depending on flags the gyp file doesn't set anymore.

Change-Id: Ibab792660600c761eb85f81e3f1fe4dce050b286
Test: Weaved can successfully connect to webservd.
Bug: 27204884
Bug: 27504653
13 files changed