Update almost all tests (except co19) to use the new try-catch syntax.

tests/language/default_interface1_negative_test.dart

Index: tests/language/default_interface1_negative_test.dart
diff --git a/tests/language/default_interface1_negative_test.dart b/tests/language/default_interface1_negative_test.dart
index e644a1dabfb5875ba0a1a32f23e691c10a4b0d3f..cd06500537a9ac3eaf9be0468882a88a5d66b8b3 100644
--- a/tests/language/default_interface1_negative_test.dart
+++ b/tests/language/default_interface1_negative_test.dart
@@ -4,14 +4,14 @@
 // VMOptions=--enable_type_checks
 // An interface with a constructor declared must have a default clause
 
-interface IA { 
+interface IA {
   IA(); // Compile time error here
-} 
+}
 
 main() {
   try {
     IA value = new IA();
-  } catch(Exception e) {
+  } on Exception catch (e) {
     print ("Got exception" + e);
     // compile-time error should not be catchable
   }