Implemented mid-level Negotiate protocol for Posix.

base/native_library_win.cc

Index: base/native_library_win.cc
diff --git a/base/native_library_win.cc b/base/native_library_win.cc
index 1c7accf5f7109f02a0fcb5062a4c0d482a932dd1..82c90fa11c2f5e25ecb8f70d94caab2c9d1b5c9c 100644
--- a/base/native_library_win.cc
+++ b/base/native_library_win.cc
@@ -8,6 +8,7 @@
 
 #include "base/file_util.h"
 #include "base/string_util.h"
+#include "base/win_util.h"
 
 namespace base {
 
@@ -48,4 +49,10 @@ string16 GetNativeLibraryName(const string16& name) {
   return name + ASCIIToUTF16(".dll");
 }
 
+string16 GetLibraryErrorMessage() {
+  DWORD last_err = GetLastError();
+  string16 err_message = win_util::FormatMessage(last_err);
+  return err_message;
+}
+
 }  // namespace base