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/605-new-string-from-bytes/src/Main.java b/test/605-new-string-from-bytes/src/Main.java
index 7dc0c15..5bd6c5d 100644
--- a/test/605-new-string-from-bytes/src/Main.java
+++ b/test/605-new-string-from-bytes/src/Main.java
@@ -20,7 +20,7 @@
 public class Main {
 
   public static void main(String[] args) throws Exception {
-    Class c = Class.forName("java.lang.StringFactory");
+    Class<?> c = Class.forName("java.lang.StringFactory");
     Method m = c.getDeclaredMethod("newStringFromBytes", byte[].class, int.class);
 
     // Loop over allocations to get more chances of doing GC while in the