Revert of Supply separate flags for onBuildTileIndex

Revert of Supply separate flags for onBuildTileIndex (patchset #1 id:1 of https://codereview.chromium.org/1402783008/ )

Reason for revert:
Missing an important line.

Original issue's description:
> Supply separate flags for onBuildTileIndex
> 
> This is a follow up to:
> https://codereview.chromium.org/1401283003/
> 
> Supply separate flags for onBuildTileIndex
> 
> Since png and jpeg's implementations of onBuildTileIndex rely on
> modifications to their underlying libraries, rather than whether we are
> running on Android, use separate flags that can be disabled
> independently.
> 
> This will allow us to easily turn off the feature. It also is a step
> towards building and running on other platforms for testing (e.g.
> valgrind/ASAN to find memory leaks etc).
> 
> BUG=skia:
> 
> Committed: https://skia.googlesource.com/skia/+/fc06e9c0e621744654e231ae6fa4460d88c0e27e

TBR=scroggo@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/67e676087cb847d40709ef639b2e2ecc7c99bbb2

[msarett, 2015-10-14 22:21:00]

Created Revert of Supply separate flags for onBuildTileIndex

[commit-bot: I haz the power, 2015-10-14 22:21:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1394433005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1394433005/1

[commit-bot: I haz the power, 2015-10-14 22:21:14]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/67e676087cb847d40709ef639b2e2ecc7c99bbb2