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

tests/language/function_malformed_result_type_test.dart

Index: tests/language/function_malformed_result_type_test.dart
diff --git a/tests/language/function_malformed_result_type_test.dart b/tests/language/function_malformed_result_type_test.dart
index 8d8a0f1fe4f12788bf3112571b0ae9d308fc6e26..c41936e0f6420afebe9018d92691fa5ddbeb28b2 100644
--- a/tests/language/function_malformed_result_type_test.dart
+++ b/tests/language/function_malformed_result_type_test.dart
@@ -10,7 +10,7 @@ isCheckedMode() {
     var i = 1;
     String s = i;
     return false;
-  } catch(var e) {
+  } catch (e) {
     return true;
   }
 }
@@ -21,7 +21,7 @@ main() {
     bool got_type_error = false;
     try {
       f();
-    } catch (TypeError error) {
+    } on TypeError catch (error) {
       got_type_error = true;
     }
     // No type error expected, since returned null is not type checked.
@@ -32,7 +32,7 @@ main() {
     bool got_type_error = false;
     try {
       f();
-    } catch (TypeError error) {
+    } on TypeError catch (error) {
       got_type_error = true;
     }
     // Type error expected in checked mode only.