GitLab

Instead of having an application for clipboard.mojo, a
view_manager.mojo, et all, we instead will have one core_services
application which provides implementations of all the services compiled
into one physical file so we don't have to pay the cost of //base/ in
each application.

For now, this just moves clipboard.mojo into core_services.

BUG=477435
R=sky@chromium.org
TBR=ben@chromium.org

Review URL: https://codereview.chromium.org/1084463003

Cr-Commit-Position: refs/heads/master@{#327077}