Normalize import paths for Sky modules

sky/tests/services/event-sender.sky

 <sky>
 <import src="../resources/chai.sky" />
 <import src="../resources/mocha.sky" />
-<import src="/mojo/services/input_events/public/interfaces/input_event_constants.mojom.sky" as="constants" />
-<import src="/mojo/services/input_events/public/interfaces/input_events.mojom.sky" as="events" />
+<import src="/gen/mojo/services/input_events/public/interfaces/input_event_constants.mojom.sky" as="constants" />
+<import src="/gen/mojo/services/input_events/public/interfaces/input_events.mojom.sky" as="events" />
+<import src="/gen/sky/services/testing/test_harness.mojom.sky" as="harness" />
 <import src="/sky/framework/shell.sky" as="shell" />
-<import src="/sky/services/testing/test_harness.mojom.sky" as="harness" />
 
 <script>
 describe('Sky event sender', function() {
   it('should be able to send events', function(done) {
     var sky = document.querySelector('sky')
     sky.addEventListener('keypress', function(event) {
       assert.equal(event.type, 'keypress');
       assert.equal(event.key, 0);
       assert.equal(event.charCode, 0x41);
       done();
     });
 
     var testHarness = shell.connectToService(
         "mojo:sky_tester", harness.TestHarness);
     testHarness.dispatchInputEvent(new events.Event({
       action: constants.EventType.KEY_PRESSED,
       key_data: new events.KeyData({
         windows_key_code: 0x41,
         text: 0x41,
         unmodified_text: 0x41,
         is_char: true,
         character: 0x41,
       }),
     }));
   });
 });
 </script>
 </sky>