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Now that kPreferHtmlOverPlugins feature has launched, enabled by
default, and now removed from the code as a flag, we can delete this
abstraction.

This folds the mapping of ASK => DETECT logic into PluginUtils
directly and cleans up the callsites.

This CL should not change Chrome's behavior in any way.

Bug: 945035
Change-Id: I4298aed3b4c5f95e4323cb658c9d42ead6c31cfb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1542496Reviewed-by: Raymes Khoury <raymes@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645354}