WebDocument::focusedNode should be focusedElement

Add WebDocument::focusedElement.

WebDocument::focusedNode should be focusedElement.
DOM, HTML, SVG specifications assume only elements can be focused.
Blink exposes focusedNode api and returns WebNode casting from Element*.
This change would make a cleaner API and expose focused
WebElement which is more rich than WebNode.

BUG=258763
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=167657

[maheshkk, 2014-02-21 20:56:53]

Please take a look.

[tkent, 2014-02-24 00:54:04]

lgtm

I'll update the CL description for the followings.

> WebDocument::focusedNode should be focusedElement 

Please summarize what this CL does.  I think this line should be "Add
focusedElement member function to WebDocument."


> DOM, HTML, SVG specifications assume only elements can be focused (Bug 258763)


Please add "BUG=258763" line to the description.

[tkent, 2014-02-24 00:55:26]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2014-02-24 00:55:36]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mahesh.kk@samsung.com/173283003/1

[commit-bot: I haz the power, 2014-02-24 03:36:17]

Change committed as 167657