Deleted OS_WIN and all Windows specific files from base.

base/files/file.h

Index: base/files/file.h
diff --git a/base/files/file.h b/base/files/file.h
index b21b15972bce7c62be0dad659cff4e76af262ac2..1984667d23ee225c6c4c9158d72370d4e3e101b7 100644
--- a/base/files/file.h
+++ b/base/files/file.h
@@ -6,9 +6,6 @@
 #define BASE_FILES_FILE_H_
 
 #include "build/build_config.h"
-#if defined(OS_WIN)
-#include <windows.h>
-#endif
 
 #if defined(OS_POSIX)
 #include <sys/stat.h>
@@ -25,17 +22,11 @@
 #include "base/move.h"
 #include "base/time/time.h"
 
-#if defined(OS_WIN)
-#include "base/win/scoped_handle.h"
-#endif
-
 FORWARD_DECLARE_TEST(FileTest, MemoryCorruption);
 
 namespace base {
 
-#if defined(OS_WIN)
-typedef HANDLE PlatformFile;
-#elif defined(OS_POSIX)
+#if defined(OS_POSIX)
 typedef int PlatformFile;
 
 #if defined(OS_BSD) || defined(OS_MACOSX) || defined(OS_NACL)
@@ -293,11 +284,7 @@ class BASE_EXPORT File {
 
   bool async() const { return async_; }
 
-#if defined(OS_WIN)
-  static Error OSErrorToFileError(DWORD last_error);
-#elif defined(OS_POSIX)
   static Error OSErrorToFileError(int saved_errno);
-#endif
 
   // Converts an error value to a human-readable form. Used for logging.
   static std::string ErrorToString(Error error);
@@ -362,11 +349,7 @@ class BASE_EXPORT File {
 
   void SetPlatformFile(PlatformFile file);
 
-#if defined(OS_WIN)
-  win::ScopedHandle file_;
-#elif defined(OS_POSIX)
   MemoryCheckingScopedFD file_;
-#endif
 
   // Path that |Initialize()| was called with. Only set if safe (i.e. no '..').
   FilePath path_;