Pass SkiaImageFilterBuilder& to FilterEffect::createImageFilter

Pass SkiaImageFilterBuilder& to FilterEffect::createImageFilter

The builder should never be null, so just make it a reference.

Drop the builder arguments on SVGFEImage::createImageFilterForLayoutObject
because it's unused, and make the LayoutObject& const while touching those
lines.

Make createImageFilter overrides private.

Committed: https://crrev.com/3f2605089ceb0bb292c09a10700ef1369569a547
Cr-Commit-Position: refs/heads/master@{#352543}

[fs, 2015-10-02 14:38:55]

fs@opera.com changed reviewers:
+ senorblanco@chromium.org

[fs, 2015-10-02 15:00:09]

fs@opera.com changed reviewers:
+ pdr@chromium.org

[fs, 2015-10-02 15:00:09]

Pretty mechanical this one.

[pdr., 2015-10-06 03:36:56]

LGTM

[pdr., 2015-10-06 03:36:57]

The CQ bit was checked by pdr@chromium.org

[commit-bot: I haz the power, 2015-10-06 03:38:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1387573003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1387573003/1

[commit-bot: I haz the power, 2015-10-06 05:54:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-06 05:55:36]

Patchset 1 (id:??) landed as
https://crrev.com/3f2605089ceb0bb292c09a10700ef1369569a547
Cr-Commit-Position: refs/heads/master@{#352543}