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

tests/standalone/status_expression_test.dart

Index: tests/standalone/status_expression_test.dart
diff --git a/tests/standalone/status_expression_test.dart b/tests/standalone/status_expression_test.dart
index 03b4098f0255f6ba05eae99203a378c281088623..c95b5559c0c082b98deac006bc27f350898f50b9 100644
--- a/tests/standalone/status_expression_test.dart
+++ b/tests/standalone/status_expression_test.dart
@@ -61,7 +61,7 @@ class StatusExpressionTest {
     Tokenizer tokenizer = new Tokenizer(input);
     try {
       tokenizer.tokenize();
-    } catch (Exception e) {
+    } on Exception catch (e) {
       thrown = e;
     }
     Expect.equals("Syntax error in '$input'", thrown.toString());
@@ -74,7 +74,7 @@ class StatusExpressionTest {
     Tokenizer tokenizer = new Tokenizer(input);
     try {
       tokenizer.tokenize();
-    } catch (Exception e) {
+    } on Exception catch (e) {
       thrown = e;
     }
     Expect.equals("Syntax error in '$input'", thrown.toString());