Convert FrameHostMsg_DidAddMessageToConsole to Mojo.

Note: Since this required changing the test
RenderViewImplTest.DispatchBeforeUnloadCanDetachFrame, I manually
re-introduced locally (the bug the test was
added for), and reran the test to confirm that it still covers the bug.

Bug: 786836
Change-Id: I110668fa6f0f261fd2ac36bb91a8d8b31c99f4f1
Commit-Queue: Lowell Manners <>
Reviewed-by: Daniel Cheng <>
Reviewed-by: Camille Lamy <>
Cr-Commit-Position: refs/heads/master@{#653137}
10 files changed