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This CL updates the existing ActivityService icons.
It also removes the default copy action to add a custom one, allowing
to change its icon.

Bug: 868104
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I16da49521bde80e1a0b41859843e257d7beb50e3
Reviewed-on: https://chromium-review.googlesource.com/1172624
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583996}