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Currently the crostini app icon handler returns an error when
|allow_placeholder_icon| is true. This should instead cause the
handler to refraim from returning any value until the real icon has
been loaded from the VM.

Bug: 1088393
Change-Id: I6dcb874193ccea91fd539c633940673275466835
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2226106
Commit-Queue: Fergus Dall <sidereal@google.com>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779246}