Avoid nearly identical toImplArray() and toImplHeapArray()

Avoid nearly identical toImplArray() and toImplHeapArray()

The only difference is the vector type, which can be made the template
argument. The value type is available as VectorType::ValueType.

BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=194867

[Jens Widell, 2015-05-04 09:57:26]

jl@opera.com changed reviewers:
+ haraken@chromium.org

[Jens Widell, 2015-05-04 09:57:27]

PTAL

I saw https://codereview.chromium.org/1112363003/ and thought it was a bit
unfortunate to duplicate toImplArray() only to use a separate vector type.

[haraken, 2015-05-04 14:09:02]

Thanks for the clean-up! LGTM.

[Jens Widell, 2015-05-04 14:10:48]

The CQ bit was checked by jl@opera.com

[commit-bot: I haz the power, 2015-05-04 14:11:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1125683002/1

[commit-bot: I haz the power, 2015-05-04 15:46:11]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=194867