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IDL parser: Reorder parser rules

Reorders IDL parser's patterns to follow Web IDL grammar[1]
as much as possible.
This CL is to reduce diffs of follow-up CLs, and does not change
any behaviors.

[1] https://heycam.github.io/webidl/#idl-grammar


Bug: 650150, 839389
Change-Id: I8885016db13f9b9af2fed18eb3e6ccf99c6365b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1807652Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697489}