Use DEFINE_TESTCLASS_SHORT macro in tests.

tests/PackBitsTest.cpp

Index: tests/PackBitsTest.cpp
diff --git a/tests/PackBitsTest.cpp b/tests/PackBitsTest.cpp
index f7d4b8e6b1b2d1c4d44ed110c716e76ae7389ce2..8a6ed88f677310c905862768d1d176279208fbb2 100644
--- a/tests/PackBitsTest.cpp
+++ b/tests/PackBitsTest.cpp
@@ -1,11 +1,12 @@
-
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+
 #include "Test.h"
+#include "TestClassDef.h"
 #include "SkPackBits.h"
 
 static const uint16_t gTest0[] = { 0, 0, 1, 1 };
@@ -125,10 +126,7 @@ static void test_pack8(skiatest::Reporter* reporter) {
     }
 }
 
-static void TestPackBits(skiatest::Reporter* reporter) {
+DEF_TEST(PackBits, reporter) {
     test_pack8(reporter);
     test_pack16(reporter);
 }
-
-#include "TestClassDef.h"
-DEFINE_TESTCLASS("PackBits", PackBitsTestClass, TestPackBits)