Revert of Avoid CTFontCreateCopyWithAttributes.

Revert of Avoid CTFontCreateCopyWithAttributes. (patchset #4 id:60001 of https://codereview.chromium.org/1344213004/ )

Reason for revert:
Causes issues with synthetic bold italic on all versions of OSX, with OSX10.10 resulting in many measurement related changes (this is expected though).

fast/text/atsui-multiple-renderers.html
fast/css/font-face-synthetic-bold-italic.html

https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Mac10_9__retina_/6168/layout-test-results/results.html

https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Mac10_10/4525/layout-test-results/results.html

Original issue's description:
> Avoid CTFontCreateCopyWithAttributes.
> 
> It appears that CTFontCreateCopyWithAttributes and
> CTFontCreateCopyWithSymbolicTraits share similar issues with the default
> font on OSX10.10. CTFontCreateWithFontDescriptor cannot be used as
> it will not work with webfonts. Since this is all low-level use, create the
> CTFonts from the underlying CGFonts directly.
> 
> BUG=chromium:524646
> 
> Committed: https://skia.googlesource.com/skia/+/d3296717b9d0930237be3502b82ab94d0b4d177f

TBR=erikchen@chromium.org,mtklein@google.com,reed@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:524646
Committed: https://skia.googlesource.com/skia/+/4de8c3a401eb3b5a5899f0bfbcc74556cd8f7bf9

[bungeman-skia, 2015-09-19 06:03:09]

Created Revert of Avoid CTFontCreateCopyWithAttributes.

[commit-bot: I haz the power, 2015-09-19 06:03:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1354323002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1354323002/1

[commit-bot: I haz the power, 2015-09-19 06:03:28]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/4de8c3a401eb3b5a5899f0bfbcc74556cd8f7bf9