Another round of cleanups for http://www.dartbug.com/15922

runtime/vm/native_arguments.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_NATIVE_ARGUMENTS_H_
 #define VM_NATIVE_ARGUMENTS_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/handles_impl.h"
@@ skipping 117 matching lines @@
     return OFFSET_OF(NativeArguments, argc_tag_);
   }
   static intptr_t argv_offset() { return OFFSET_OF(NativeArguments, argv_); }
   static intptr_t retval_offset() {
     return OFFSET_OF(NativeArguments, retval_);
   }
   static intptr_t AutoSetupScopeMask() {
     return AutoSetupScopeBits::mask_in_place();
   }
 
-  static int ParameterCountForResolution(const Function& function) {
+  static intptr_t ParameterCountForResolution(const Function& function) {
     ASSERT(function.is_native());
     ASSERT(!function.IsConstructor());  // Not supported.
-    int count = function.NumParameters();
+    intptr_t count = function.NumParameters();
     if (function.is_static() && function.IsClosureFunction()) {
       // The closure object is hidden and not accessible from native code.
       // However, if the function is an instance closure function, the captured
       // receiver located in the context is made accessible in native code at
       // index 0, thereby hidding the closure object at index 0.
       count--;
     }
     return count;
   }
 
@@ skipping 65 matching lines @@
 
   Isolate* isolate_;  // Current isolate pointer.
   int argc_tag_;  // Encodes argument count and invoked native call type.
   RawObject*(*argv_)[];  // Pointer to an array of arguments to runtime call.
   RawObject** retval_;  // Pointer to the return value area.
 };
 
 }  // namespace dart
 
 #endif  // VM_NATIVE_ARGUMENTS_H_