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Flash is deprecated since M87 and almost entirely removed in M88+.
This CL removes ContentSettingsType::PLUGINS from PluginUtils and
returns CONTENT_SETTING_BLOCK for any Flash-related request.

Bug: 1149393
Change-Id: I7649e568e634556a698edc066efba70b53a1f291
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2582219
Commit-Queue: Illia Klimov <elklm@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835875}