IDL lexer: update integer regex to latest Web IDL spec

IDL lexer: update integer regex to latest Web IDL spec

The regex for integers in Web IDL was just updated.
This doesn't change behavior, but improves clarity a bit.
This CL updates us to this new regex.

Relevant W3C bug:
Bug 19778 - Wrong regex for integer
https://www.w3.org/Bugs/Public/show_bug.cgi?id=19778

TEST=idl_lexer_test.py

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=216080

[Nils Barth (inactive), 2013-08-05 05:47:34]

Hi Noel,
Quick CL keeping us up-to-date with spec.

[noelallen1, 2013-08-06 14:52:08]

LGTM assuming we have the appropriate lexer tests already for octal.

[Nils Barth (inactive), 2013-08-07 01:08:10]

On 2013/08/06 14:52:08, noelallen1 wrote:
> LGTM assuming we have the appropriate lexer tests already for octal.

Current integers in the lexer test do include octal; these are:

integer 00
integer 01
integer 0123
integer 123
integer 0x123

These seemed a bit short (don't check hex case or letters), so I've expanded
these to:
integer 00
integer 01
integer 0123
integer 01234567
integer 123
integer 1234567890
integer 0x123
integer 0X123
integer 0x1234567890AbCdEf
integer 0X1234567890aBcDeF

[commit-bot: I haz the power, 2013-08-07 01:18:42]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/nbarth@chromium.org/22140002/5001

[commit-bot: I haz the power, 2013-08-07 05:08:15]

Change committed as 216080