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

utils/tests/peg/peg_test.dart

Index: utils/tests/peg/peg_test.dart
diff --git a/utils/tests/peg/peg_test.dart b/utils/tests/peg/peg_test.dart
index b39a12f90d2669124a52624a7679279f23c71df8..a8cc7d8c2df305d6788860fa7a42bdbae04a20a6 100644
--- a/utils/tests/peg/peg_test.dart
+++ b/utils/tests/peg/peg_test.dart
@@ -291,7 +291,7 @@ show(grammar, rule, input) {
   var ast;
   try {
     ast = grammar.parse(rule, input);
-  } catch (var exception) {
+  } catch (exception) {
     if (exception is ParseError)
       ast = exception;
     else
@@ -307,7 +307,7 @@ void check(grammar, rule, input, expected) {
   var ast;
   try {
     ast = grammar.parse(rule, input);
-  } catch (var exception) {
+  } catch (exception) {
     ast = exception;
   }