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By accident, we didn't pass the icon further to the XWindow from
the PlatformWindowProperties. This CL fixes that.

Based on the patch provided by mail@maciej.szmigiero.name.

Bug: 1007996
Change-Id: I3718f5f1698438ed07c5f453cdb445cd50a48219
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864803Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#706961}