Remove unused methods from SkScalerContext.

Remove unused methods from SkScalerContext.

The methods getLocalMatrixWithoutTextSize and
getSingleMatrixWithoutTextSize on SkScalerContext were added as a
temporary measure for CoreText issues. Now that the CoreText
SkScalerContext is using other means to fix these issues more completely,
remove these now unused methods.

Committed: https://skia.googlesource.com/skia/+/8ece6eb37b4f3c98587efa071ce565d26b156e9a

[bungeman-skia, 2015-01-27 18:54:18]

bungeman@google.com changed reviewers:
+ mtklein@google.com, reed@google.com

[bungeman-skia, 2015-01-27 18:54:21]

The CQ bit was checked by bungeman@google.com

[commit-bot: I haz the power, 2015-01-27 18:54:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/883833002/1

[commit-bot: I haz the power, 2015-01-27 18:55:00]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-01-28 00:54 UTC

[mtklein, 2015-01-27 18:59:31]

lgtm

[commit-bot: I haz the power, 2015-01-27 19:01:46]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/8ece6eb37b4f3c98587efa071ce565d26b156e9a