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Fixes a bug where if we received png data and then failed to decode
that, we'd try to decode it as jpeg too unintentionally, cf
https://codereview.chromium.org/2943363003/diff/120001/chrome/renderer/chrome_render_frame_observer.cc

This CL was uploaded by git cl split.

R=thestig@chromium.org

Bug: 177475
Change-Id: I1fbfc4b8b1fa009e10ace632a09619f463305cb6
Reviewed-on: https://chromium-review.googlesource.com/891899
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532872}