Small fix in Scanner

runtime/vm/object.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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 3261 matching lines @@
  public:
   RawGrowableObjectArray* TokenObjects() const;
   void SetTokenObjects(const GrowableObjectArray& value) const;
 
   RawExternalTypedData* GetStream() const;
   void SetStream(const ExternalTypedData& stream) const;
 
   RawString* GenerateSource() const;
   RawString* GenerateSource(TokenPosition start,
                             TokenPosition end) const;
-  TokenPosition ComputeSourcePosition(TokenPosition tok_pos) const;
+  intptr_t ComputeSourcePosition(TokenPosition tok_pos) const;
 
   RawString* PrivateKey() const;
 
   static const intptr_t kBytesPerElement = 1;
   static const intptr_t kMaxElements = kSmiMax / kBytesPerElement;
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawTokenStream));
   }
 
@@ skipping 5231 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_