Deleted OS_WIN and all Windows specific files from base.

base/process/process_handle.h

Index: base/process/process_handle.h
diff --git a/base/process/process_handle.h b/base/process/process_handle.h
index 77f2c585cfcc71087596855fa6f83ac643ce9a6c..3d6cf1e5c6921d244f5852bf3a38a7c23f3319bc 100644
--- a/base/process/process_handle.h
+++ b/base/process/process_handle.h
@@ -11,28 +11,19 @@
 #include "build/build_config.h"
 
 #include <sys/types.h>
-#if defined(OS_WIN)
-#include <windows.h>
-#endif
 
 namespace base {
 
 // ProcessHandle is a platform specific type which represents the underlying OS
 // handle to a process.
 // ProcessId is a number which identifies the process in the OS.
-#if defined(OS_WIN)
-typedef HANDLE ProcessHandle;
-typedef DWORD ProcessId;
-typedef HANDLE UserTokenHandle;
-const ProcessHandle kNullProcessHandle = NULL;
-const ProcessId kNullProcessId = 0;
-#elif defined(OS_POSIX)
+#if defined(OS_POSIX)
 // On POSIX, our ProcessHandle will just be the PID.
 typedef pid_t ProcessHandle;
 typedef pid_t ProcessId;
 const ProcessHandle kNullProcessHandle = 0;
 const ProcessId kNullProcessId = 0;
-#endif  // defined(OS_WIN)
+#endif  // defined(OS_POSIX)
 
 // Returns the id of the current process.
 BASE_EXPORT ProcessId GetCurrentProcId();