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

tests/compiler/dart2js_extra/naming_test.dart

Index: tests/compiler/dart2js_extra/naming_test.dart
diff --git a/tests/compiler/dart2js_extra/naming_test.dart b/tests/compiler/dart2js_extra/naming_test.dart
index b21708e6d3a36ad5de4615c5c5a3d621965c8e49..56c9eb4e21c61fdd590f9bd9404b0c36760872a6 100644
--- a/tests/compiler/dart2js_extra/naming_test.dart
+++ b/tests/compiler/dart2js_extra/naming_test.dart
@@ -213,10 +213,10 @@ class NamingTest {
     var caught = false;
     try {
       throw new MyException();
-    } catch (var exc) {
+    } catch (exc) {
       try {
         throw new MyException();
-      } catch (var exc2) {
+      } catch (exc2) {
         exc = 9;
       }
       Expect.equals(9, exc);
@@ -396,7 +396,7 @@ class NamingTest {
     var wasCaught = false;
     try {
       throw new with(0, 0);
-    } catch(with e) {
+    } on with catch (e) {
       wasCaught = true;
       Expect.equals(5, e.x);
     }