X11 and Ozone: Regression: fix setting up an icon.

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}

ui/platform_window/x11/x11_window.cc

@@ -65,6 +65,7 @@ ui::XWindow::Configuration ConvertInitPropertiesToXWindowConfig(
   }
 
   config.bounds = properties.bounds;
+  config.icon = properties.icon;
   config.force_show_in_taskbar = properties.force_show_in_taskbar;
   config.keep_on_top = properties.keep_on_top;
   config.visible_on_all_workspaces = properties.visible_on_all_workspaces;