Replace blink::UserActivationUpdateType with a mojo enum

This is a preparation CL for migrating FrameMsg_UpdateUserActivationState
to mojo.

Today FrameMsg_UpdateUserActivationState takes the enum
blink::UserActivationUpdateType as argument. The corresponding mojo
method (to be added), will need to pass a blink::mojom::FrameMsg_UpdateUserActivationState
enum instead.

Hence, this replaces blink::UserActivationUpdateType with
blink::mojom::UserActivationUpdateType.

BUG=1041066
R=avi@chromium.org, dcheng@chromium.org, dtapuska@chromium.org, haraken@chromium.org

Change-Id: Iaf0f857df04033790b8c0f59f09cdfb3258c857b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2002754
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#732348}
26 files changed