Revert of Reland #1: Add a short term solution to fix OSX 10.11 system font rendering problems.

Revert of Reland #1: Add a short term solution to fix OSX 10.11 system font rendering problems. (patchset #2 id:20001 of https://codereview.chromium.org/1289823008/ )

Reason for revert:
Broke layout tests on Mac 10.10

http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.10/builds/2551/steps/webkit_tests/logs/stdio

Original issue's description:
> Reland #1: Add a short term solution to fix OSX 10.11 system font rendering problems.
> 
> I forgot to update the test FontFamilyMatcherMacTest.YosemiteFontWeights.
> 
> > I landed a CL (https://codereview.chromium.org/1276003003/) which fixes system
> > font problems on OSX 10.9 and OSX 10.10. The CL also fixed MatchNSFontFamily()
> > to correctly return the system font on 10.11, but this causes glyph rendering
> > problems. In the short term, I'm adding logic to MatchNSFontFamily() to return
> > nil on 10.11, which was the original behavior before I landed that CL.
> >
> > BUG=521034
> > Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=200618
> 
> BUG=521034
> TBR=tkent@chromium.org, keishi@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=200653

TBR=tkent@chromium.org,keishi@chromium.org,erikchen@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=521034
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=200658

[yurys, 2015-08-17 18:42:46]

Created Revert of Reland #1: Add a short term solution to fix OSX 10.11 system
font rendering problems.

[commit-bot: I haz the power, 2015-08-17 18:43:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1299723002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1299723002/1

[commit-bot: I haz the power, 2015-08-17 18:43:39]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=200658