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This CL adds a csp_validator::ParseCSP method to parse a CSP string. Existing
code doing the parsing is changed to use this new method.

This CL should have no behavior change. Also add unit tests exercising the new
method.

BUG=896041

Change-Id: Ic97e31ab23b6d21c0b3ad4b771a2fd7c37bec6d4
Reviewed-on: https://chromium-review.googlesource.com/c/1292825
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602224}