change WebViewImpl::inputModeOfFocusedElement to return lowered string.

change WebViewImpl::inputModeOfFocusedElement to return lowered string.
This string casted to WebString is compared to string such as "kana", "verbatim".

The input mode attribute is enumerated attribute [1], which should be　case-insensitive [2]. 
We had better normalize values in Blink because it's a web　standard matter.

[1]
 http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#attr-fe-inputmode
[2]
 http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#enumerated-attribute

In this cl we decide to use lower case.

and delete an unused test case.

BUG=244688
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=153609

[yoichio, 2013-07-04 07:21:25]

Please review.

[tkent, 2013-07-04 09:52:02]

Please write a reason of lower casing in the CL description.

A comment in WebTextInputInfo.h should mention the case conversion.

[yoichio, 2013-07-05 02:28:28]

On 2013/07/05 02:27:53, yoichio wrote:

Add description

[tkent, 2013-07-05 03:15:13]

lgtm

> We need compare them ignoring case but WebString has no such a way so decide
to pre-conversion to lower-case at AtomicString. 

We usually convert WebString objects to string16 objects in Chromium code.  This
sentence is not so reasonable.
My expectation was something like the following:

--------------------------------
The input mode attribute is enumerated attribute [1], which should be
case-insensitive [2]. We had better normalize values in Blink because it's a web
standard matter.

[1]
http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-co...
[2]
http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsynta...
--------------------------------

[commit-bot: I haz the power, 2013-07-05 03:26:45]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/yoichio@chromium.org/18094004/3001

[commit-bot: I haz the power, 2013-07-05 04:53:51]

Change committed as 153609