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Since the actual Flash binary has been removed from Chrome, our old code
path to display the Flash is deprecated placeholder no longer works.

This CL adds an alternate code path that directly checks the requested
MIME type instead of looking for the plugin metadata (which is no
loaded since the plugin is missing).

This CL doesn't restore the infobar to show that Flash is deprecated
for M88+. That's working as intended.

TEST=I manually tested it on Linux with the official build.

Bug: 1069833
Change-Id: I4c1758c5c7d4ed2026c59ae1407689468d85c1bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532862Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826465}