Change the generation number from 65536 to 65535 in the free entry of cross-reference table

BUG=pdfium:342
R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1550753002 .
diff --git a/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp b/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
index 95415b1..8c3defd 100644
--- a/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
+++ b/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
@@ -1636,7 +1636,7 @@
         CFX_ByteString str;
         str = m_ObjectOffset.GetPtrAt(1)
                   ? "xref\r\n"
-                  : "xref\r\n0 1\r\n0000000000 65536 f\r\n";
+                  : "xref\r\n0 1\r\n0000000000 65535 f\r\n";
         if (m_File.AppendString(str) < 0) {
           return -1;
         }
@@ -1668,7 +1668,7 @@
         j++;
       }
       if (i == 1) {
-        str.Format("0 %d\r\n0000000000 65536 f\r\n", j);
+        str.Format("0 %d\r\n0000000000 65535 f\r\n", j);
       } else {
         str.Format("%d %d\r\n", i, j - i);
       }
@@ -1710,7 +1710,7 @@
       }
       objnum = m_NewObjNumArray.ElementAt(i);
       if (objnum == 1) {
-        str.Format("0 %d\r\n0000000000 65536 f\r\n", j - i + 1);
+        str.Format("0 %d\r\n0000000000 65535 f\r\n", j - i + 1);
       } else {
         str.Format("%d %d\r\n", objnum, j - i);
       }