Deleted OS_WIN and all Windows specific files from base.

base/files/file_util.cc

Index: base/files/file_util.cc
diff --git a/base/files/file_util.cc b/base/files/file_util.cc
index 4b6b8886d8ad5d8bc0fd4855b10c97db52420d2e..44c42bf16a90e5f1b075f65ad75dc2f78224c1cd 100644
--- a/base/files/file_util.cc
+++ b/base/files/file_util.cc
@@ -4,9 +4,6 @@
 
 #include "base/files/file_util.h"
 
-#if defined(OS_WIN)
-#include <io.h>
-#endif
 #include <stdio.h>
 
 #include <fstream>
@@ -198,12 +195,6 @@ bool TouchFile(const FilePath& path,
                const Time& last_modified) {
   int flags = File::FLAG_OPEN | File::FLAG_WRITE_ATTRIBUTES;
 
-#if defined(OS_WIN)
-  // On Windows, FILE_FLAG_BACKUP_SEMANTICS is needed to open a directory.
-  if (DirectoryExists(path))
-    flags |= File::FLAG_BACKUP_SEMANTICS;
-#endif  // OS_WIN
-
   File file(path, flags);
   if (!file.IsValid())
     return false;
@@ -225,15 +216,9 @@ bool TruncateFile(FILE* file) {
   long current_offset = ftell(file);
   if (current_offset == -1)
     return false;
-#if defined(OS_WIN)
-  int fd = _fileno(file);
-  if (_chsize(fd, current_offset) != 0)
-    return false;
-#else
   int fd = fileno(file);
   if (ftruncate(fd, current_offset) != 0)
     return false;
-#endif
   return true;
 }