ART: Fix type parameter in tests

Move Class to Class<?>, Constructor to Constructor<?>, and in
general clean up reflection.

Test: m test-art-host-run-test
Change-Id: I3a4223ee8d14d032015edf34bf27135757f7138c
diff --git a/test/142-classloader2/src/Main.java b/test/142-classloader2/src/Main.java
index 89dadce..80b00e7 100644
--- a/test/142-classloader2/src/Main.java
+++ b/test/142-classloader2/src/Main.java
@@ -25,8 +25,8 @@
     private static ClassLoader createClassLoader(String dexPath, ClassLoader parent) {
         try {
             Class<?> myClassLoaderClass = Class.forName("MyPathClassLoader");
-            Constructor constructor = myClassLoaderClass.getConstructor(String.class,
-                                                                        ClassLoader.class);
+            Constructor<?> constructor = myClassLoaderClass.getConstructor(String.class,
+                                                                           ClassLoader.class);
             return (ClassLoader)constructor.newInstance(dexPath, parent);
         } catch (Exception e) {
             // Ups, not available?!?!