Moved service_registry from services to mojo/services/service_registry

Moved service_registry from services to mojo/services/service_registry

It needs to be in a conventional public location to be available to consumer repos.

R=tonyg@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/5403b15ebdcc4b326437fcf85036953f3c6825c7

[hansmuller1, 2015-02-28 00:20:23]

hansmuller@google.com changed reviewers:
+ sky@chromium.org

[hansmuller1, 2015-02-28 00:21:29]

hansmuller@google.com changed reviewers:
+ hansmuller@google.com

[hansmuller1, 2015-02-28 00:21:29]

PTAL

[tonyg, 2015-02-28 00:33:51]

tonyg@chromium.org changed reviewers:
+ tonyg@chromium.org

[tonyg, 2015-02-28 00:33:51]

If tests are happy, this lgtm

[hansmuller, 2015-02-28 00:36:50]

Committed patchset #1 (id:1) manually as
5403b15ebdcc4b326437fcf85036953f3c6825c7 (presubmit successful).