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This CL converts PrintHostMsg_AccessibilityTree message to
SetAccessibilityTree() in mojom::PrintManagerHost.

Bug: 1008939
Change-Id: I8f21acd96b472da4e7312805ed7fd51f44162405
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377666
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804594}