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All async WebAppIconManager read icon methods must return void.

A call site should check if an app has appropriate icon
via corresponding Has*Icon methods.

These changes are required for integration with AppService.

This code is disabled by default behind kDesktopPWAsWithoutExtensions
base feature.

Bug: 1029221
Change-Id: Iad46ea383f062d0b3787e11d20b5f89a08eb61f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1943650Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720123}