Fix infinite recursion in CPDF_Parser::ParseIndirectObjectAt().

fpdfsdk/src/fpdfview_embeddertest.cpp

 // Copyright 2015 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.
 
 #include <limits>
 #include <string>
 
 #include "../../testing/embedder_test.h"
 #include "../../fpdfsdk/include/fpdfview.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 159 matching lines @@
   EXPECT_EQ(dest_by_index, dest);
 
   // Bad value type for item from Dests NameTree array.
   dest = FPDF_GetNamedDestByName(document(), "WrongType");
   EXPECT_EQ(nullptr, dest);
 
   // No such destination in either Dest NameTree or dictionary.
   dest = FPDF_GetNamedDestByName(document(), "Bogus");
   EXPECT_EQ(nullptr, dest);
 }
+
+// The following tests pass if the document opens without crashing.
+TEST_F(FPDFViewEmbeddertest, Crashers) {
+  EXPECT_TRUE(OpenDocument("testing/resources/bug_451830.pdf"));
+}