Revert of allow canvas to force conservative clips (for speed)

Revert of allow canvas to force conservative clips (for speed) (patchset #7 id:120001 of https://codereview.chromium.org/541593005/)

Reason for revert:
multipicturedraw failed on nvprmsaa -- don't know why yet

Original issue's description:
> Allow SkCanvas to be initialized to force conservative rasterclips. This has the following effects:
> 
> 1. Queries to the current clip will be conservatively large. This can mean the quickReject may return false more often.
> 
> 2. The conservative clips mean less work is done.
> 
> 3. Enabled by default for Gpu, Record, and NoSaveLayer canvases.
> 
> 4. API is private for now.
> 
> Committed: https://skia.googlesource.com/skia/+/27a5e656c3d6ef22f9cb34de18e1b960da3aa241

TBR=robertphillips@google.com,bsalomon@google.com,mtklein@google.com,junov@google.com
NOTREECHECKS=true
NOTRY=true

Committed: https://skia.googlesource.com/skia/+/6f09709519b79a1159f3826645f1c5fbc101ee11

[reed1, 2014-09-09 19:50:18]

Created Revert of allow canvas to force conservative clips (for speed)

[commit-bot: I haz the power, 2014-09-09 19:50:55]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/reed@google.com/554033003/1

[commit-bot: I haz the power, 2014-09-09 19:51:27]

Committed patchset #1 (id:1) as 6f09709519b79a1159f3826645f1c5fbc101ee11

[reed2, 2014-09-10 01:45:10]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/560713002/ by reed@chromium.org.

The reason for reverting is: May just rebaseline, plus want to see the results
of the chrome tests, so re-trying this CL..

[bsalomon, 2014-09-10 13:49:52]

On 2014/09/10 01:45:10, reed2 wrote:
> A revert of this CL (patchset #1 id:1) has been created in
> https://codereview.chromium.org/560713002/ by mailto:reed@chromium.org.
> 
> The reason for reverting is: May just rebaseline, plus want to see the results
> of the chrome tests, so re-trying this CL..

There was a nice perf improvement picked up by the alerting mechanism on
skiaperf.com:

http://skiaperf.com/cl/44

[bsalomon, 2014-09-10 13:49:54]

On 2014/09/10 01:45:10, reed2 wrote:
> A revert of this CL (patchset #1 id:1) has been created in
> https://codereview.chromium.org/560713002/ by mailto:reed@chromium.org.
> 
> The reason for reverting is: May just rebaseline, plus want to see the results
> of the chrome tests, so re-trying this CL..

There was a nice perf improvement picked up by the alerting mechanism on
skiaperf.com:

http://skiaperf.com/cl/44