Remove unused variable 'heapIndex'

Bug: NA

Though we set this variable, we never use its value. This causes a
warning in Android.

Change-Id: I84492fd97e8c6f23db7bf51c116d227551ae7a94
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/469358
Commit-Queue: Leon Scroggins <scroggo@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
Auto-Submit: Leon Scroggins <scroggo@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
1 file changed