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CL:2332079 changed default application opening logic to prefer an
installed app over opening in the browser.

Change this logic to detect an HTML file extension and bypass the
installed application selection so that the browser remains the
preferred opening target to avoid user surprises. (N.B. Users can still
manually select the installed app as default for HTML).

Bug: 1121396
Tests: unit_tests --gtest_filter="*ChooseAndSetDefaultTask_FallbackHtmlTextApp"
Change-Id: I1359be9d06b2ff27c7928c59ba68a92a66430584
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391944
Commit-Queue: Alex Danilo <adanilo@chromium.org>
Reviewed-by: Bugs Nash <bugsnash@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804655}