Ensure that a javascript compatibility warning results in a

runtime/vm/flow_graph_builder.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_FLOW_GRAPH_BUILDER_H_
 #define VM_FLOW_GRAPH_BUILDER_H_
 
 #include "platform/assert.h"
 #include "platform/globals.h"
 #include "vm/allocation.h"
@@ skipping 137 matching lines @@
                    intptr_t osr_id,
                    bool is_optimizing);
 
   FlowGraph* BuildGraph();
 
   ParsedFunction* parsed_function() const { return parsed_function_; }
   const ZoneGrowableArray<const ICData*>& ic_data_array() const {
     return ic_data_array_;
   }
 
-  void WarnOnJSIntegralNumTypeTest(AstNode* node,
+  // Return true if a Javascript compatibility warning should be emitted at
+  // runtime for this type test.
+  bool WarnOnJSIntegralNumTypeTest(AstNode* node,
                                    const AbstractType& type) const;
-  void JSWarning(intptr_t token_pos, const char* msg) const;
+
   void Bailout(const char* reason) const;
 
   intptr_t AllocateBlockId() { return ++last_used_block_id_; }
   void SetInitialBlockId(intptr_t id) { last_used_block_id_ = id; }
 
   intptr_t context_level() const;
 
   void IncrementLoopDepth() { ++loop_depth_; }
   void DecrementLoopDepth() { --loop_depth_; }
   intptr_t loop_depth() const { return loop_depth_; }
@@ skipping 414 matching lines @@
   // Output parameters.
   GrowableArray<TargetEntryInstr**> true_successor_addresses_;
   GrowableArray<TargetEntryInstr**> false_successor_addresses_;
 
   intptr_t condition_token_pos_;
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_BUILDER_H_