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`ExtensionPolicyMigrator::CopyPoliciesIfUnset()` now takes the hashed
extension id, instead of the extension id itself, and linearly searches
in the policy bundle to find a matching policy.

Where this function was called with an extension id, the extension id is
replaced with the hashed one.

Note that HashedExtensionId generates a hash that uses upper-case
letters.

Bug: 878528
Change-Id: I6290fe894cfcc6e0c440b639908bd1f0866d49ba
Reviewed-on: https://chromium-review.googlesource.com/1207891Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590311}