Remove weborigin rules from DEPS as weborigin/ was fold back under platform/. 

This is follow-up to https://codereview.chromium.org/54053006.

BUG=307407

TBR=ch.dumez@samsung.com

Review URL: https://codereview.chromium.org/109863002

git-svn-id: svn://svn.chromium.org/blink/trunk@163394 bbb929c8-8fbe-4397-9dbb-9b2b20218538
IDL compiler: inheritance for interfaces

Note that this does *not* require parsing the parent interface:
we just need the *name* of the parent, which is in the IDL file itself.

BUG=239771
NOTRY=true

Review URL: https://codereview.chromium.org/109873002

git-svn-id: svn://svn.chromium.org/blink/trunk@163396 bbb929c8-8fbe-4397-9dbb-9b2b20218538
IDL compiler: [EventConstructor] (basic)

Initial CL for [EventConstructor];
many additional cases to consider, to do in followups.

BUG=239771
NOTRY=true

Review URL: https://codereview.chromium.org/106103005

git-svn-id: svn://svn.chromium.org/blink/trunk@163397 bbb929c8-8fbe-4397-9dbb-9b2b20218538