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This CL converts PrintHostMsg_DidGetDocumentCookie message to
DidGetDocumentCookie() in mojom::PrintManagerHost.

Bug: 1008939
Change-Id: I8cb535babd6fbd70efa408675e235ba8375c5873
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352297Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#798989}