IDL: Remove the CompareHow special case

IDL: Remove the CompareHow special case

It's a special type used only for Range.compareBoundaryPoints()'s |how|
argument, and all the bindings layer actually does is cast a 32-bit int to
the Range::CompareHow C++ enumeration, without any checks. The spec's IDL
has the argument's type as |unsigned short|.

This doesn't change any behavior (the value checks were always in the C++
code, and still are), aligns our IDL files with the spec, and, most
significantly, removes the special case from the code generator.

BUG=413257
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=182498

[Jens Widell, 2014-09-23 12:09:29]

jl@opera.com changed reviewers:
+ haraken@chromium.org

[Jens Widell, 2014-09-23 12:09:30]

PTAL

[haraken, 2014-09-23 12:23:27]

LGTM

[Jens Widell, 2014-09-23 12:25:10]

The CQ bit was checked by jl@opera.com

[commit-bot: I haz the power, 2014-09-23 12:26:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/592293003/1

[commit-bot: I haz the power, 2014-09-23 14:11:31]

Committed patchset #1 (id:1) as 182498