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This CL imposes a limit on the maximum number of page patterns an extension can
whitelist using the chrome.declarativeNetRequest.addWhitelistedPages API. This
limit is currently set to 100. A new property MAX_NUMBER_OF_WHITELISTED_PAGES is
introduced in the declarativeNetRequest API for the same.

It is important to limit this since the whitelisted patterns are stored in the
browser memory (and also persisted across sessions using Extension preferences).

BUG=811460, 696822
Doc=https://docs.google.com/document/d/1Fhm-t0JCc3dcmwyBX_i7TGyuJ2QjqDechv1-VCRBo5o/edit?usp=sharing

Change-Id: I674da154107ac06269827272576f1af911f13338
Reviewed-on: https://chromium-review.googlesource.com/987392
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547983}