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Quickview loads image previews by calling decode() on the <img> element
after its 'src' attribute is set. When the image is finished decoding it
should replace the previous decoded image.

Changes decode() failures to send a message to the container that decode
failed and in turn, set the contentURL to '' which in turn unloads the
webview and displays the 'no preview available' icon.

Bug: 645021
Tests: browser_tests --gtest_filter="*QuickViewBrokenImage"
Change-Id: Ie1d19f1a4f1014486eaaec9581007f25d4c7f165
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992954
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#730129}