GitLab

Replace PrintMsg_PrintingDone, PrintMsg_PrintPages, and
PrintMsg_SetPrintingEnabled IPC messages with new Mojo methods. Update
AwPrintManager and HeadlessPrintManager to also use these new methods.

Bug: 1008939
Test: Print a webpage and PDF
Change-Id: I3a403dd47ffc9c4debe819d26b00eccbd24b1180
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1876473
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710576}