GitLab

Replace the PrintMsg_PrintFrameContent IPC message with a new Mojo
method, and update PrintCompositeClient to use this method.

Bug: 1008939
Test: ./browser_tests --gtest_filter=PrintBrowserTest.*
Change-Id: I6656d5e8c260828a4c940a2111bf51ee3efdb8df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1979327
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728796}