Revert of Implement canComputeFastBounds() for image filters.

Revert of Implement canComputeFastBounds() for image filters. (patchset #8 id:130001 of https://codereview.chromium.org/1296943002/ )

Reason for revert:
This causes a syntax error.

http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_compile_dbg_ng/builds/87819/steps/compile%20%28with%20patch%29/logs/stdio

Original issue's description:
> Implement canComputeFastBounds() for image filters.
> 
> Image filters have never implemented this check, which means that
> filters which affect transparent black falsely claim they can compute
> their bounds.
> 
> Implemented an affectsTransparentBlack() virtual for image 
> filters, and a similar helper function for color filters.
> 
> This will affect the following GMs: imagefiltersscaled 
> (lighting, perlin noise now filter to clip), 
> colorfilterimagefilter (new test case), imagefiltersclipped 
> (perlin noise now filters to clip).
> 
> Note: I de-inlined SkPaint::canComputeFastBounds() to avoid adding
> a dependency from SkPaint.h to SkImageFilter.h.h. Skia benches show
> no impact from this change, but will watch the perf bots carefully.
> 
> BUG=4212
> 
> Committed: https://skia.googlesource.com/skia/+/915881fe743f9a789037695f543bc6ea189cd0cb

TBR=reed@google.com,senorblanco@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=4212
Committed: https://skia.googlesource.com/skia/+/12d8472d31ea5edb636d7d5214db253570115c40

[herb_g, 2015-08-20 16:28:31]

Created Revert of Implement canComputeFastBounds() for image filters.

[commit-bot: I haz the power, 2015-08-20 16:28:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1300403003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1300403003/1

[commit-bot: I haz the power, 2015-08-20 16:28:49]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/12d8472d31ea5edb636d7d5214db253570115c40

[Stephen White, 2015-08-20 18:10:21]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1301823005/ by senorblanco@chromium.org.

The reason for reverting is: The Mac compile issue was fixed here:
https://chromium.googlesource.com/chromium/src/+/fdd331a42ae0b9a6909a12102073....