Remove support in the gpu to use hardware AA lines. Current code paths could not reach this code and thus was never used.

The blend opt flag kDisableBlend should now be able to be removed, however it is left in this CL and will removed in its own.

BUG=skia:
R=bsalomon@google.com

Author: egdaniel@google.com

Review URL: https://codereview.chromium.org/427823002
6 files changed