Remove SVGFilterElement's filterRes* attributes and setFilterRes()

Remove SVGFilterElement's filterRes* attributes and setFilterRes()

This patch removes filterRes per the following discussion on blink-dev:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/o0i2UtqOApY/d7i_1akVwa8J

The C++ side of this patch is a straightforward code removal. Where possible,
tests have been updated to use FEConvolveMatrix.targetX for testing
SVGAnimatableInteger values. Tests with just filterRes have been removed.

BUG=353272
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=196268

[pdr., 2015-05-31 22:59:16]

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

[chrishtr, 2015-06-01 15:58:09]

The CQ bit was checked by chrishtr@chromium.org

[chrishtr, 2015-06-01 15:58:10]

lgtm

[commit-bot: I haz the power, 2015-06-01 15:58:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1153403003/1

[fs, 2015-06-01 16:01:33]

lgtm

[pdr., 2015-06-01 16:45:22]

This patch is failing because two tests (smallFonts.svg, textFeatures.svg) used
filterRes and now have pixel differences. There are several hundred
NeedsRebaseline entries in TestExpectations from crbug.com/321237, including
these two tests. I'm going to wait for those to filter through before landing
this.

[commit-bot: I haz the power, 2015-06-01 18:09:30]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-01 18:09:32]

Try jobs failed on following builders:
  linux_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/6...)

[philipj_slow, 2015-06-01 18:15:41]

Also LGTM, red diffs are the best diffs!

[pdr., 2015-06-01 21:35:03]

Patchset #2 (id:20001) has been deleted

[pdr., 2015-06-01 21:54:52]

The CQ bit was checked by pdr@chromium.org

[pdr., 2015-06-01 21:54:53]

The patchset sent to the CQ was uploaded after l-g-t-m from
chrishtr@chromium.org, philipj@opera.com, fs@opera.com
Link to the patchset: https://codereview.chromium.org/1153403003/#ps40001
(title: "Rebase + updated smallFonts.svg and textFeatures.svg")

[pdr., 2015-06-01 22:42:05]

The CQ bit was unchecked by pdr@chromium.org

[pdr., 2015-06-01 22:42:07]

The CQ bit was checked by pdr@chromium.org

[commit-bot: I haz the power, 2015-06-01 23:33:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1153403003/40001

[commit-bot: I haz the power, 2015-06-02 01:27:34]

Committed patchset #2 (id:40001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=196268