mojom: Remove braces from module statements and make them come first.

sky/viewer/test_observer.mojom

Index: sky/viewer/test_observer.mojom
diff --git a/sky/viewer/test_observer.mojom b/sky/viewer/test_observer.mojom
index 10740b6c2ab807e852c320e4a87680b8ef39c52c..ed74c9d4c787e14adb8009292cdae0003940ef5d 100644
--- a/sky/viewer/test_observer.mojom
+++ b/sky/viewer/test_observer.mojom
@@ -2,10 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module sky {
+module sky;
 
 interface TestObserver {
   OnTestComplete(string test_result);
 };
-
-}