system_api: dbus: rename metrics_event proto file Naming the protobuf specification "service.proto" causes conflicts in the chrome build. This may be related to https://github.com/protocolbuffers/protobuf/issues/2520 namespace protobuf_service_2eproto { void InitDefaults() { Naming the file "service.proto" makes the namespace contain the word "service", which happens to be used by another protobuf for vm_concierge. So I get a link-time multiple definition. BUG=chromium:729335 TEST=compiles and runs correctly with chromium changes that use it Change-Id: Ic83489d3bab15f627288e44c323e5032da76d874 Reviewed-on: https://chromium-review.googlesource.com/1199965 Commit-Ready: Luigi Semenzato <[email protected]> Tested-by: Luigi Semenzato <[email protected]> Reviewed-by: Dan Erat <[email protected]>