Revert of Templatize SkToXXX.

Revert of Templatize SkToXXX. (patchset #2 id:20001 of https://codereview.chromium.org/1814153003/ )

Reason for revert:
Chrome does not yet have std::underlying_type.

Original issue's description:
> Templatize SkToXXX.
> 
> Makes the checked cast in debug more correct, avoiding new
> warnings in vs2015.
> 
> BUG=skia:4553
> 
> Committed: https://skia.googlesource.com/skia/+/0be9e806af72b3e029e691eef5c891c90d3fd320

TBR=reed@google.com,mtklein@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4553
Committed: https://skia.googlesource.com/skia/+/89edf7a95ea694ba2c0a33adedf553c4183cdc19

[bungeman-skia, 2016-03-18 18:53:02]

Created Revert of Templatize SkToXXX.

[commit-bot: I haz the power, 2016-03-18 18:53:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1820433002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1820433002/1

[commit-bot: I haz the power, 2016-03-18 18:53:19]

Description was changed from

==========
Revert of Templatize SkToXXX. (patchset #2 id:20001 of
https://codereview.chromium.org/1814153003/ )

Reason for revert:
Chrome does not yet have std::underlying_type.

Original issue's description:
> Templatize SkToXXX.
> 
> Makes the checked cast in debug more correct, avoiding new
> warnings in vs2015.
> 
> BUG=skia:4553
> 
> Committed:
https://skia.googlesource.com/skia/+/0be9e806af72b3e029e691eef5c891c90d3fd320

TBR=reed@google.com,mtklein@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4553
==========

to

==========
Revert of Templatize SkToXXX. (patchset #2 id:20001 of
https://codereview.chromium.org/1814153003/ )

Reason for revert:
Chrome does not yet have std::underlying_type.

Original issue's description:
> Templatize SkToXXX.
> 
> Makes the checked cast in debug more correct, avoiding new
> warnings in vs2015.
> 
> BUG=skia:4553
> 
> Committed:
https://skia.googlesource.com/skia/+/0be9e806af72b3e029e691eef5c891c90d3fd320

TBR=reed@google.com,mtklein@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4553

Committed:
https://skia.googlesource.com/skia/+/89edf7a95ea694ba2c0a33adedf553c4183cdc19
==========

[commit-bot: I haz the power, 2016-03-18 18:53:20]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/89edf7a95ea694ba2c0a33adedf553c4183cdc19