Revert of Make SkBlurImageFilter capable of cropping during blur (GPU path).

Revert of Make SkBlurImageFilter capable of cropping during blur (GPU path). (patchset #15 id:260001 of https://codereview.chromium.org/1431593002/ )

Reason for revert:
Causing valgrind error. Looks like the issue is in conolve_gaussiand_2d where bounds is not getting set if there is no srcBounds, but later on that bounds is being read in the creation of a TextureDomain.

Original issue's description:
> Make SkBlurImageFilter capable of cropping during blur (GPU path).
> 
> This is the GPU equivalent of https://codereview.chromium.org/1415653003/.
> 
> It requires passing down the bounds of the crop rect (srcBounds), and 
> turning the blur 3-patch optimization in convolve_gaussian() into a 5-patch:
> clear above and below srcBounds, blur with bounds checks inside left and
> right rects, blur without bounds checks in middle rect.
> 
> Note: this change causes minor pixels diffs in the 
> imagefilterscropexpand GM: for odd crop positions relative to the
> dstBounds, we are now correctly resampling at an even pixel boundary.
> 
> BUG=skia:4502, skia:4526
> 
> Committed: https://skia.googlesource.com/skia/+/c57e0ded7d535523cfc6bf07c78e5f3479bb8c42

TBR=bsalomon@google.com,senorblanco@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4502, skia:4526
Committed: https://skia.googlesource.com/skia/+/edce2a8576c4f701674d925731e10e569e9dc9b0

[egdaniel, 2015-11-09 18:04:05]

Created Revert of Make SkBlurImageFilter capable of cropping during blur (GPU
path).

[commit-bot: I haz the power, 2015-11-09 18:04:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1407133019/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1407133019/1

[commit-bot: I haz the power, 2015-11-09 18:04:25]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/edce2a8576c4f701674d925731e10e569e9dc9b0