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We need to be able to disable just the redirect part of the feature, so
that the users will still see the original image, but other coverage
metrics will be recorded for analysis.

This CL also removes detecting images based on file extensions.

Bug: 1042869
Change-Id: I6842a09386664d9ce61e364bbba2b2aef9000195
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017671
Commit-Queue: rajendrant <rajendrant@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735168}