Rename FullscreenElementStack::requestFullScreenForElement to requestFullscreen

Rename FullscreenElementStack::requestFullScreenForElement to requestFullscreen

It's unambigious without the suffix, and now matches the spec:
http://fullscreen.spec.whatwg.org/#dom-element-requestfullscreen

If there ever was any disambiguity about document fullscreen vs.
element fullscreen, there isn't any longer, at least not here.

BUG=383813
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=179787

[philipj_slow, 2014-08-07 21:59:51]

PTAL. Obviously conflicts with https://codereview.chromium.org/449133003/ but
I'll aim to land this first and resolve the conflicts on the other review.

[falken, 2014-08-08 02:31:02]

On 2014/08/07 21:59:51, philipj wrote:
> PTAL. Obviously conflicts with https://codereview.chromium.org/449133003/ but
> I'll aim to land this first and resolve the conflicts on the other review.

LGTM

[philipj_slow, 2014-08-08 05:04:35]

The CQ bit was checked by philipj@opera.com

[commit-bot: I haz the power, 2014-08-08 05:04:55]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/philipj@opera.com/444033003/1

[commit-bot: I haz the power, 2014-08-08 05:08:29]

Change committed as 179787