Move services/shell to services/service_manager

Moving the symbols to the service_manager namespace will
happen in a follow-up CL.

Copied from https://codereview.chromium.org/2419723002 because
rietveld is choking on that one.

BUG=None
NOPRESUBMIT=true
TBR=ben@chromium.org
TBR=dcheng@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2419063003
Cr-Commit-Position: refs/heads/master@{#425565}
696 files changed