Fix ALL the include guards.

fpdfsdk/include/fsdk_mgr.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#ifndef _FPDFSDK_MGR_H
-#define _FPDFSDK_MGR_H
+#ifndef FPDFSDK_INCLUDE_FSDK_MGR_H_
+#define FPDFSDK_INCLUDE_FSDK_MGR_H_
 
 #include "../../public/fpdf_formfill.h"
 #include "../../public/fpdf_fwlevent.h" // cross platform keycode and events define.
 #include "fsdk_common.h"
 #include "fsdk_define.h"
 #include "fx_systemhandler.h"
 #include "fsdk_baseannot.h"
 #include "fsdk_baseform.h"
 #include "fsdk_annothandler.h"
 #include "fsdk_actionhandler.h"
@@ skipping 533 matching lines @@
                         {
                                 j--;
                         }
                 }
 
                 if (nStartPos < m) QuickSort(nStartPos, m, bAscend, pCompare);
                 if (nStopPos > m) QuickSort(m, nStopPos, bAscend, pCompare);
         }
 };
 
-
-#endif //_FPDFSDK_MGR_H
+#endif  // FPDFSDK_INCLUDE_FSDK_MGR_H_