Fix build of pdf_hint_table_fuzzer.

core/fpdfapi/fpdf_parser/cpdf_dictionary.cpp

Index: core/fpdfapi/fpdf_parser/cpdf_dictionary.cpp
diff --git a/core/fpdfapi/fpdf_parser/cpdf_dictionary.cpp b/core/fpdfapi/fpdf_parser/cpdf_dictionary.cpp
index 5b9699d01926a03d24cf5fd03bf692ef609bea03..5696fc0c8d7b874aefaf0637eb08843fbc2dccf0 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_dictionary.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_dictionary.cpp
@@ -19,6 +19,9 @@
 #include "third_party/base/logging.h"
 #include "third_party/base/stl_util.h"
 
+CPDF_Dictionary::CPDF_Dictionary()
+    : CPDF_Dictionary(CFX_WeakPtr<CFX_ByteStringPool>()) {}
+
 CPDF_Dictionary::CPDF_Dictionary(const CFX_WeakPtr<CFX_ByteStringPool>& pPool)
     : m_pPool(pPool) {}