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

tests/language/ct_const_test.dart

Index: tests/language/ct_const_test.dart
diff --git a/tests/language/ct_const_test.dart b/tests/language/ct_const_test.dart
index ed121c813fcddbbac45cdbcbc557125dabce5353..6f7a5348136fac26a9bcd5b05d3b1df71c94f47e 100644
--- a/tests/language/ct_const_test.dart
+++ b/tests/language/ct_const_test.dart
@@ -90,7 +90,7 @@ class CTConstTest {
     bool caughtException = false;
     try {
       c11dItaly["green"] = 0;
-    } catch (IllegalAccessException e) {
+    } on IllegalAccessException catch (e) {
       caughtException = true;
     }
     Expect.equals(true, caughtException);
@@ -99,7 +99,7 @@ class CTConstTest {
     caughtException = false;
     try {
       c11dItaly.clear();
-    } catch (IllegalAccessException e) {
+    } on IllegalAccessException catch (e) {
       caughtException = true;
     }
     Expect.equals(true, caughtException);
@@ -108,7 +108,7 @@ class CTConstTest {
     caughtException = false;
     try {
       c11dItaly.remove("orange");
-    } catch (IllegalAccessException e) {
+    } on IllegalAccessException catch (e) {
       caughtException = true;
     }
     Expect.equals(true, caughtException);