Move services/files/*.mojom -> mojo/services/files/public/interfaces/.

Ditto for terminal_client.mojom, previously in examples/echo_terminal.

Fix the sky terminal example.

R=erg@chromium.org

Review URL: https://codereview.chromium.org/1013313002

examples/terminal/terminal.sky

@@ -24,8 +24,8 @@
 import 'dart:async';
 import 'dart:core';
 import 'dart:sky';
-import 'package:examples/echo_terminal/terminal_client.mojom.dart' as terminal;
-import '/sky/framework/embedder.dart';
+import 'package:mojo/services/terminal/public/interfaces/terminal_client.mojom.dart' as terminal;
+import 'package:sky/framework/embedder.dart';
 import 'terminal_display.dart';
 import 'terminal_file_impl.dart';
 

examples/terminal/terminal_file_impl.dart

@@ -5,8 +5,8 @@
 import 'dart:async';
 import 'dart:core';
 import 'dart:mojo.core';
-import 'package:services/files/file.mojom.dart' as files;
-import 'package:services/files/types.mojom.dart' as files;
+import 'package:mojo/services/files/public/interfaces/file.mojom.dart' as files;
+import 'package:mojo/services/files/public/interfaces/types.mojom.dart' as files;
 
 import 'terminal_display.dart';