Revert of Mike's radial gradient CL with better float -> int.

Revert of Mike's radial gradient CL with better float -> int. (patchset #7 id:120001 of https://codereview.chromium.org/1109643002/)

Reason for revert:
compile failures.

Original issue's description:
> Mike's radial gradient CL with better float -> int.
> 
> patch from issue 1072303005 at patchset 40001 (http://crrev.com/1072303005#ps40001)
> 
> This looks quite launchable.  radial_gradient3, min of 100 samples:
>   N5:  985µs -> 946µs
>   MBP: 395µs -> 279µs
> 
> On my MBP, most of the meat looks like it's now in reading the cache and writing to dst one color at a time.  Is that something we could do in float math rather than with a lookup table?
> 
> BUG=skia:
> 
> CQ_EXTRA_TRYBOTS=client.skia.android:Test-Android-GCC-Nexus5-CPU-NEON-Arm7-Debug-Trybot,Test-Android-GCC-Nexus9-CPU-Denver-Arm64-Debug-Trybot
> 
> Committed: https://skia.googlesource.com/skia/+/abf6c5cf95e921fae59efb487480e5b5081cf0ec

TBR=reed@google.com,robertphillips@google.com,mtklein@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/8d3e9dff3f3db3fa77c383e4cd6c47b9898a8fcd

[mtklein, 2015-04-27 18:20:49]

Created Revert of Mike's radial gradient CL with better float -> int.

[commit-bot: I haz the power, 2015-04-27 18:21:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1109883003/1

[commit-bot: I haz the power, 2015-04-27 18:21:19]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/8d3e9dff3f3db3fa77c383e4cd6c47b9898a8fcd