Don't leak the shader by reffing twice in SkRectShaderImageFilter.

Don't leak the shader by reffing twice in SkRectShaderImageFilter.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/b00f54d8b8365a398d7a745c6105d441a7429418

[mtklein, 2014-08-22 20:35:57]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-08-22 20:36:25]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/501563002/1

[commit-bot: I haz the power, 2014-08-22 20:36:26]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from a valid reviewer till 2014-08-23 02:36 UTC

[bsalomon, 2014-08-22 20:36:59]

lgtm

[commit-bot: I haz the power, 2014-08-22 20:43:02]

Committed patchset #1 (1) as b00f54d8b8365a398d7a745c6105d441a7429418

[reed2, 2014-08-23 01:52:44]

thanks

[reed2, 2014-08-23 01:52:45]

thanks