Update Custom Elements API to new names.

Update Custom Elements API to new names.

document.register => document.registerElement
enteredViewCallback => attachedCallback
leftViewCallback => detachedCallback

This also removes the long-deprecated webkitRegister method.

BUG=180965
R=haraken@chromium.org, morrita@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=164213

[dominicc (has gone to gerrit), 2013-12-20 02:59:44]

PTAL

[haraken, 2013-12-20 03:09:33]

LGTM for bindings/.

The name change should be reviewed by morrita-san.

[Hajime Morrita, 2013-12-20 03:20:26]

lgtm. You can have trybots for browser_tests if you want before landing.

[dominicc (has gone to gerrit), 2013-12-20 04:03:47]

On 2013/12/20 03:20:26, morrita1 wrote:
> lgtm. You can have trybots for browser_tests if you want before landing.

Thanks for the quick review. There's a Chrome-side change under review at
<https://codereview.chromium.org/119743002/> that needs to go first so we don't
break WebView browser tests.

[dominicc (has gone to gerrit), 2013-12-20 06:31:58]

Committed patchset #3 manually as r164213 (presubmit successful).