Fix floating point issues on Windows.

runtime/platform/c99_support_win.h

 // Copyright (c) 2011, 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 PLATFORM_C99_SUPPORT_WIN_H_
 #define PLATFORM_C99_SUPPORT_WIN_H_
 
 // Visual C++ is missing a bunch of C99 math macros and
 // functions. Define them here.
 
@@ skipping 29 matching lines @@
 }
 
 static inline double trunc(double x) {
   if (x < 0) {
     return ceil(x);
   } else {
     return floor(x);
   }
 }
 
-static inline double round(double x) {

[Mads Ager (google), 2012/11/28 09:26:26]

We should still have the round method declared here. I think round is only used
in one place, so I would just put your new implementation in here as a static
inline.

[aam-me, 2012/11/28 12:14:36]

Done.

-  if (x < 0) {
-    return ceil(x - 0.5);
-  } else {
-    return floor(x + 0.5);
-  }
-}
-
 #endif  // PLATFORM_C99_SUPPORT_WIN_H_