Change .dbus.xml extension to .dbus-xml

Work around gyp's inability to handle compound extensions by expecting
a similar looking simple extension for XML files definine DBus
interfaces.  We'll need to rename these sources in the places we're
using them already.

Bug: 23380180
Change-Id: Ieb2050f3ef05456cd70de65c3e128d57a6a508f8
2 files changed