Use new try-catch syntax in runtime/, tools/, and utils/.

utils/css/uitest.dart

Index: utils/css/uitest.dart
diff --git a/utils/css/uitest.dart b/utils/css/uitest.dart
index 7f35c1a14f883057e5cff120de5b7733a8e8500b..12c6425daf05b35de08d6d30e224e6c7a1540343 100644
--- a/utils/css/uitest.dart
+++ b/utils/css/uitest.dart
@@ -32,7 +32,7 @@ void runCss([bool debug = false, bool parseOnly = false]) {
   if (!debug) {
     try {
       cssParseAndValidate(cssExpr, cssWorld);
-    } catch (final cssException) {
+    } catch (cssException) {
       templateValid = false;
       dumpTree = cssException.toString();
     }
@@ -47,14 +47,14 @@ void runCss([bool debug = false, bool parseOnly = false]) {
       stylesheetTree.add("\n============>Tree Dump<============\n");
       stylesheetTree.add(stylesheet.toDebugString());
       dumpTree = stylesheetTree.toString();
-    } catch (final cssParseException) {
+    } catch (cssParseException) {
       templateValid = false;
       dumpTree = cssParseException.toString();
     }
   } else {
     try {
       dumpTree = cssParseAndValidateDebug(cssExpr, cssWorld);
-    } catch (final cssException) {
+    } catch (cssException) {
       templateValid = false;
       dumpTree = cssException.toString();
     }