Fix the exception thrown by getDeclaredFields if the class is unavailable.

http://b/issue?id=2634005
diff --git a/vm/reflect/Reflect.c b/vm/reflect/Reflect.c
index 7e93f19..912ff47 100644
--- a/vm/reflect/Reflect.c
+++ b/vm/reflect/Reflect.c
@@ -220,8 +220,6 @@
 
     if (clazz == NULL) {
         LOGW("Unable to match class for part: '%s'\n", *pSignature);
-        dvmClearException(dvmThreadSelf());
-        dvmThrowException("Ljava/lang/NoSuchMethodException;", NULL);
     }
     *pSignature = signature;
     return clazz;