Add catch and finally to bannedNames (#346)

Generating all the bindings generates codes with these keywords,
leading to analysis errors. Members with this name will be renamed
using `@JS`.

Author: srujzs

web_generator/lib/src/banned_names.dart

@@ -5,9 +5,11 @@
 const bannedNames = <String>{
   'assert',
   'break',
+  'catch',
   'continue',
-  'extends',
   'default',
+  'extends',
+  'finally',
   'in',
   'is',
   'var',