clang-format all pdfium code.

public/fpdf_flatten.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 PUBLIC_FPDF_FLATTEN_H_
 #define PUBLIC_FPDF_FLATTEN_H_
 
 #include "fpdfview.h"
 
 // Result codes.
-#define FLATTEN_FAIL            0   // Flatten operation failed.
-#define FLATTEN_SUCCESS         1   // Flatten operation succeed.
-#define FLATTEN_NOTHINGTODO     2   // There is nothing to be flattened.
+#define FLATTEN_FAIL 0         // Flatten operation failed.
+#define FLATTEN_SUCCESS 1      // Flatten operation succeed.
+#define FLATTEN_NOTHINGTODO 2  // There is nothing to be flattened.
 
 // Flags.
-#define FLAT_NORMALDISPLAY     0
-#define FLAT_PRINT             1
+#define FLAT_NORMALDISPLAY 0
+#define FLAT_PRINT 1
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 // Function: FPDFPage_Flatten
-//          Make annotations and form fields become part of the page contents itself.
+//          Make annotations and form fields become part of the page contents
+//          itself.
 // Parameters:
 //          page  - Handle to the page, as returned by FPDF_LoadPage().
-//          nFlag - Intended use of the flattened result: 0 for normal display, 1 for printing.
+//          nFlag - Intended use of the flattened result: 0 for normal display,
+//          1 for printing.
 // Return value:
-//          Either FLATTEN_FAIL, FLATTEN_SUCCESS, or FLATTEN_NOTHINGTODO (see above).
+//          Either FLATTEN_FAIL, FLATTEN_SUCCESS, or FLATTEN_NOTHINGTODO (see
+//          above).
 // Comments:
-//          Currently, all failures return FLATTEN_FAIL, with no indication for the reason
+//          Currently, all failures return FLATTEN_FAIL, with no indication for
+//          the reason
 //          for the failure.
 DLLEXPORT int STDCALL FPDFPage_Flatten(FPDF_PAGE page, int nFlag);
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif  // PUBLIC_FPDF_FLATTEN_H_