Move HTMLInputElement method argument defaults into IDL file

Move HTMLInputElement method argument defaults into IDL file

The stepUp()/stepDown() methods' argument should default to 1, and the
setRangeText() method's selectionMode argument should default to
"preserve".

This matches the specification, and doesn't change behavior since these
defaults were already implemented in the C++ code.

BUG=258153
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180647

[Jens Widell, 2014-08-20 12:50:06]

PTAL

[haraken, 2014-08-20 12:57:49]

LGTM

Can't we remove some code from C++ for the default "preserve" value?

[Jens Widell, 2014-08-20 13:03:30]

On 2014/08/20 12:57:49, haraken wrote:
> LGTM
> 
> Can't we remove some code from C++ for the default "preserve" value?

It's implemented in HTMLTextFormControlElement::setRangeText() as the final
branch in an if/else if/else that compares the argument to all other acceptable
values. Previously when we passed in a null string, we ended up in the same
branch.

[Jens Widell, 2014-08-20 13:03:49]

The CQ bit was checked by jl@opera.com

[commit-bot: I haz the power, 2014-08-20 13:05:03]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jl@opera.com/471163006/1

[commit-bot: I haz the power, 2014-08-20 14:03:23]

Committed patchset #1 (1) as 180647