Cleanup: Get rid of OS_WIN/OS_POSIX ifdefs from MojoApplication

base/files/file.h

Index: base/files/file.h
diff --git a/base/files/file.h b/base/files/file.h
index 1913bc7f6c408c8e1e3840da712895ff2fd88259..bc98f67fb27aba6a9566cb544989202a39e647f4 100644
--- a/base/files/file.h
+++ b/base/files/file.h
@@ -18,6 +18,7 @@
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
+#include "base/files/platform_file.h"
 #include "base/files/scoped_file.h"
 #include "base/move.h"
 #include "base/time/time.h"
@@ -30,17 +31,13 @@ namespace base {
 
 class FilePath;
 
-#if defined(OS_WIN)
-typedef HANDLE PlatformFile;
-#elif defined(OS_POSIX)
-typedef int PlatformFile;
-
+#if defined(OS_POSIX)
 #if defined(OS_BSD) || defined(OS_MACOSX) || defined(OS_NACL)
 typedef struct stat stat_wrapper_t;
 #else
 typedef struct stat64 stat_wrapper_t;
 #endif
-#endif  // defined(OS_POSIX)
+#endif
 
 // Thin wrapper around an OS-level file.
 // Note that this class does not provide any support for asynchronous IO, other