Fix an embedder test with leaked page object

public/fpdf_edit.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_EDIT_H_
 #define PUBLIC_FPDF_EDIT_H_
 
 #include <stdint.h>
@@ skipping 20 matching lines @@
 #endif  // __cplusplus
 
 // Create a new PDF document.
 //
 // Returns a handle to a new document, or NULL on failure.
 DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_CreateNewDocument();
 
 // Create a new PDF page.
 //
 //   document   - handle to document.
-//   page_index - the index of the page to create.
+//   page_index - suggested index of the page to create. If it is larger than
+//                document's current last index(L), the created page index is
+//                the next available index -- L+1.
 //   width      - the page width.
 //   height     - the page height.
 //
 // Returns the handle to the new page.
 //
-// The page should be deleted with |FPDFPage_Delete| when finished.
+// The page should be closed with CPDF_ClosePage() when finished as
+// with any other page in the document.
 DLLEXPORT FPDF_PAGE STDCALL FPDFPage_New(FPDF_DOCUMENT document,
                                          int page_index,
                                          double width,
                                          double height);
 
 // Delete the page at |page_index|.
 //
 //   document   - handle to document.
 //   page_index - the index of the page to delete.
 DLLEXPORT void STDCALL FPDFPage_Delete(FPDF_DOCUMENT document, int page_index);
@@ skipping 174 matching lines @@
 DLLEXPORT FPDF_BOOL STDCALL FPDFImageObj_SetBitmap(FPDF_PAGE* pages,
                                                    int nCount,
                                                    FPDF_PAGEOBJECT image_object,
                                                    FPDF_BITMAP bitmap);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif  // __cplusplus
 
 #endif  // PUBLIC_FPDF_EDIT_H_