The server side code can use the Provider<CurrentUser> to obtain
the current user identity when it needs one. The client side
only needs it in one place, Link, to compute the identity for
the "#mine" display. This is easily obtained from the already
existing static account reference. We might want to look at
using gwt-guice for the client side in the future, but that is
out of scope for now.
Signed-off-by: Shawn O. Pearce <sop@google.com>
65d2cd8784