Remove support for remaining deprecated features.

sdk/lib/_internal/compiler/implementation/scanner/listener.dart

Index: sdk/lib/_internal/compiler/implementation/scanner/listener.dart
diff --git a/sdk/lib/_internal/compiler/implementation/scanner/listener.dart b/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
index 65f35e28cbcdfe26365afb3c1c1150dc2c988d96..883093042e8a1a011975231d361eb2f32eadd1c0 100644
--- a/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
+++ b/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
@@ -1346,8 +1346,11 @@ class NodeListener extends ElementListener {
       NodeList arguments = new NodeList.singleton(argument);
       pushNode(new Send(receiver, new Operator(token), arguments));
     }
-    if (identical(tokenString, '===') || identical(tokenString, '!==')) {
-      listener.onDeprecatedFeature(token, tokenString);
+    if (identical(tokenString, '===')) {
+      listener.reportError(token, MessageKind.UNSUPPORTED_EQ_EQ_EQ);
+    }
+    if (identical(tokenString, '!==')) {
+      listener.reportError(token, MessageKind.UNSUPPORTED_BANG_EQ_EQ);
     }
   }
 
@@ -1497,7 +1500,8 @@ class NodeListener extends ElementListener {
   void endRethrowStatement(Token throwToken, Token endToken) {
     pushNode(new Rethrow(throwToken, endToken));
     if (identical(throwToken.stringValue, 'throw')) {
-      listener.onDeprecatedFeature(throwToken, 'throw without an expression');
+      listener.reportError(throwToken, 
+                           MessageKind.UNSUPPORTED_THROW_WITHOUT_EXP);
     }
   }