Convert getter and catch syntax in tests; fix resulting bugs

compiler/javatests/com/google/dart/compiler/type/covariant_class.dart

Index: compiler/javatests/com/google/dart/compiler/type/covariant_class.dart
===================================================================
--- compiler/javatests/com/google/dart/compiler/type/covariant_class.dart	(revision 11229)
+++ compiler/javatests/com/google/dart/compiler/type/covariant_class.dart	(working copy)
@@ -16,24 +16,24 @@
 
 class Super {
   A field;
-  A get accessor() { return null; }
+  A get accessor { return null; }
   void set accessor(A newValue) { }
   A method() { return null; }
   
   var untypedField;
-  get untypedAccessor() { return null; }
+  get untypedAccessor { return null; }
   set untypedAccessor(newValue) { }
   untypedMethod() { return null; }
 }
 
 class Sub extends Super {
   B field;
-  B get accessor() { return null; }
+  B get accessor { return null; }
   void set accessor(B newValue) { }
   B method() { return null; }
   
   B untypedField;
-  B get untypedAccessor() { return null; }
+  B get untypedAccessor { return null; }
   set untypedAccessor(B newValue) { }
   B untypedMethod() { return null; }