[WEBPImageEncoder] Use local buffer allocation instead of WTF::Vector

[WEBPImageEncoder] Use local buffer allocation instead of WTF::Vector

Blink r199183 changed the encoder to no longer reserve WTF::Vector capacity.
An alternative is to no longer use a WTF::Vector, and allocate the buffer in
an OwnPtr<T[]> instead.

BUG=504690
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=200702

[Noel Gordon, 2015-08-10 06:01:22]

noel@chromium.org changed reviewers:
+ junov@chromium.org

[Noel Gordon, 2015-08-10 06:03:58]

Refer to https://code.google.com/p/chromium/issues/detail?id=459763#c17

[Noel Gordon, 2015-08-17 03:23:06]

Ping?

[Justin Novosad, 2015-08-17 14:46:36]

On 2015/08/17 03:23:06, noel gordon wrote:
> Ping?

lgtm

[Noel Gordon, 2015-08-18 02:34:17]

The CQ bit was checked by noel@chromium.org

[commit-bot: I haz the power, 2015-08-18 02:34:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1285533002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1285533002/1

[commit-bot: I haz the power, 2015-08-18 03:57:13]

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

[commit-bot: I haz the power, 2015-08-18 03:57:13]

Try jobs failed on following builders:
  linux_chromium_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Noel Gordon, 2015-08-18 04:44:17]

The CQ bit was checked by noel@chromium.org

[commit-bot: I haz the power, 2015-08-18 04:44:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1285533002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1285533002/1

[commit-bot: I haz the power, 2015-08-18 05:43:54]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=200702