Make the mojom files under //mojo/services/network/interfaces basically the same as the ones in the…

Make the mojom files under //mojo/services/network/interfaces basically the same as the ones in the mojo repo.

Now, as far as I know, the only difference is that the ones in the mojo
repo still have "public".

* Add the appropriate directory to the import path, so that
  "third_party/..." is no longer needed in imports.
* Add the DartPackage="mojo_services" annotation to module statements.
* Remove one spurious import.

The BUILD.gn file isn't the same. I'll ponder ways of fixing this, but
it's not a super high priority.

R=jamesr@chromium.org

Committed: https://github.com/domokit/monet7da2f1903fdbb9607576cec9d9c4107b08ff84b7

[jamesr, 2015-10-13 00:31:40]

lgtm

to unify the BUILD.gn file we'd need to make the mojom template more
configurable by something like //build/module_args/ or the newfangled
//build_modules/ mechanism.

[viettrungluu, 2015-10-13 01:21:19]

Committed patchset #1 (id:1) manually as
7da2f1903fdbb9607576cec9d9c4107b08ff84b7 (presubmit successful).