Update references to Source/WebKit/chromium/ in WATCHLISTS
Update references to Source/WebKit/chromium/ in WATCHLISTS

Source/WebKit/chromium/ was split into public/, Source/web/, and
possibly other directories over a number of commits, but WATCHLISTS
were not updated to match. For the updated paths, I've verified that
there are actually matching and reasonable files in Source/web/,
public/web/ and/or public/platform/.

As per the comment at the top of the file, .* was not added to the
end of the patterns, even if they had it before.

BUG=none
NOTRY=true

Review URL: https://codereview.chromium.org/55243009

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@161152 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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