Revert of add new blit2 methods in support of antialiased hairlines guard flag SK_SUPPORT_LEGACY_BLITANTIH2V2

Revert of add new blit2 methods in support of antialiased hairlines guard flag SK_SUPPORT_LEGACY_BLITANTIH2V2 (patchset #2 id:20001 of https://codereview.chromium.org/1060153003/)

Reason for revert:
DEPS roll is failing, one such example:

http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_rel/builds/73847/steps/ash_unittests%20%28with%20patch%29/logs/stdio

More here:

   https://codereview.chromium.org/1091483003

This CL was the only CL in the roll when things started to fail.

Original issue's description:
> add new blit2 methods in support of antialiased hairlines
> 
> before:
>    9M	1	528µs	530µs	539µs	607µs	5%	▁▁▁▁▁▁▁▁█▂	8888	path_hairline_small_AA_quad
> 
> after:
>    9M	1	355µs	356µs	358µs	375µs	2%	▂▁▁▁▁▁▁▁▁█	8888	path_hairline_small_AA_quad
> 
> BUG=skia:
> 
> does require new baselines (bug chrome is guarded)
> 
> Committed: https://skia.googlesource.com/skia/+/dd83031b98db4c6d3d0de2353bf115152a7d1464

TBR=caryclark@google.com,reed@chromium.org,reed@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/f91e676f941c7e9ec91ac298eaa32e4bf8f52762

[jcgregorio, 2015-04-15 13:16:53]

Created Revert of add new blit2 methods in support of antialiased hairlines
guard flag SK_SUPPORT_LEGACY_BLITANTIH2V2