GitLab

First, parse WATCHLISTS. If it parses, scan the lines to check that:
- the entries are sorted
- WATCHLIST_DEFINITIONS matches WATCHLISTS.

The scanner doesn't parse the dictionary literal but extracts names
using re assuming that:
- the lines providing the name of rules matches a regexp pattern
- WATCHLIST_DEFINITIONS comes before WATCHLISTS
as it's sufficient for this purpose.

Stop grouping blink_.* rules and separating from the others in
WATCHLISTS_DEFINTIONS. WATCHLISTS already has them mixed.

As a bonus, remove an unused method GetDefaultTryConfigs().

Bug: 
Change-Id: I92ccc1e4d31b9bdfb97f5cf187ee44191397c895
Reviewed-on: https://chromium-review.googlesource.com/593708
Commit-Queue: Paweł Hajdan Jr. <phajdan.jr@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491353}