Use renderer spellchecker for windows.

chrome/renderer/spellchecker/spellcheck.h

Index: chrome/renderer/spellchecker/spellcheck.h
===================================================================
--- chrome/renderer/spellchecker/spellcheck.h	(revision 31826)
+++ chrome/renderer/spellchecker/spellcheck.h	(working copy)
@@ -10,7 +10,7 @@
 #include <vector>
 
 #include "app/l10n_util.h"
-#include "base/file_descriptor_posix.h"
+#include "base/platform_file.h"
 #include "base/string16.h"
 #include "base/time.h"
 #include "chrome/renderer/spellchecker/spellcheck_worditerator.h"
@@ -18,10 +18,6 @@
 
 class Hunspell;
 
-namespace base {
-class FileDescriptor;
-}
-
 namespace file_util {
 class MemoryMappedFile;
 }
@@ -32,7 +28,7 @@
 
   ~SpellCheck();
 
-  void Init(const base::FileDescriptor& bdict_fd,
+  void Init(base::PlatformFile file,
             const std::vector<std::string>& custom_words,
             const std::string language);
 
@@ -101,7 +97,7 @@
   // The hunspell dictionary in use.
   scoped_ptr<Hunspell> hunspell_;
 
-  base::FileDescriptor fd_;
+  base::PlatformFile file_;
   std::vector<std::string> custom_words_;
 
   // Represents character attributes used for filtering out characters which