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:

Review URL: https://codereview.chromium.org/1394433005
1 file changed