Revert of Skia roll 6b0d6b4:b2f7fce (patchset #1 of https://codereview.chromium.org/516563003/)

Reason for revert:
It broke some antialiasing tests on Win7, see:
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7/builds/19724/steps/webkit_tests/logs/stdio

The output has some odd comma added after each character. It doesn't seem to be a rebase problem.

Original issue's description:
> Skia roll 6b0d6b4:b2f7fce
>
> https://skia.googlesource.com/skia/+log/6b0d6b43cf662735dc804d8142383452c7f246f9..b2f7fce9e034c3b6749e75a129e7836df3529706
>
> CQ_EXTRA_TRYBOTS=tryserver.blink:linux_blink_rel
> TBR=djsollen@google.com
>
> Committed: https://chromium.googlesource.com/chromium/src/+/98c591a509f0c760d514fe079cf507ef1f7e76a4

TBR=djsollen@google.com,skia-deps-roller@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/515753004

Cr-Commit-Position: refs/heads/master@{#292356}

DEPS

@@ -38,7 +38,7 @@ vars = {
   # to update other nacl_*_revision's.
   'libvpx_revision': '4e6bc04ba5f53c570e057fe1df5c470a67aaf144', # r291661
   'sfntly_revision': '1bdaae8fc788a5ac8936d68bf24f37d977a13dac',
-  'skia_revision': 'b2f7fce9e034c3b6749e75a129e7836df3529706',
+  'skia_revision': '6b0d6b43cf662735dc804d8142383452c7f246f9',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.