Use Google3 style guide with .clang-format

Test: style change only, builds ok
Change-Id: I885180e24cb2e7b58cfb4967c3bcb40058ce4078
diff --git a/tools/aapt2/test/Test.h b/tools/aapt2/test/Test.h
index d4845cf..c9188bf 100644
--- a/tools/aapt2/test/Test.h
+++ b/tools/aapt2/test/Test.h
@@ -24,9 +24,7 @@
 #include <gtest/gtest.h>
 
 namespace aapt {
-namespace test {
+namespace test {}  // namespace test
+}  // namespace aapt
 
-} // namespace test
-} // namespace aapt
-
-#endif // AAPT_TEST_TEST_H
+#endif  // AAPT_TEST_TEST_H