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As part of the Flash/Plugins deprecation, the resource identifier
becomes obsolete. This CL removes resource_identifier from the
HostContentSettingsMap private methods only.

The rest methods API will be cleaned separately.

Bug: 1134547
Change-Id: Id74420f86abcd91b034af1eb040f09d1d95d456f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517587Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Illia Klimov <elklm@google.com>
Auto-Submit: Illia Klimov <elklm@google.com>
Cr-Commit-Position: refs/heads/master@{#824078}