Use unsigned page indexes in CPDF_HintTables.

core/fpdfapi/fpdf_parser/cpdf_hint_tables.h

Index: core/fpdfapi/fpdf_parser/cpdf_hint_tables.h
diff --git a/core/fpdfapi/fpdf_parser/cpdf_hint_tables.h b/core/fpdfapi/fpdf_parser/cpdf_hint_tables.h
index cda0925de81cdb2cdb9476716df1f3bc3339c299..1943c79f4488152850a2da568950e0503b7ea1db 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_hint_tables.h
+++ b/core/fpdfapi/fpdf_parser/cpdf_hint_tables.h
@@ -22,13 +22,13 @@ class CPDF_HintTables {
   CPDF_HintTables(CPDF_DataAvail* pDataAvail, CPDF_Dictionary* pLinearized);
   virtual ~CPDF_HintTables();
 
-  bool GetPagePos(int index,
+  bool GetPagePos(uint32_t index,
                   FX_FILESIZE* szPageStartPos,
                   FX_FILESIZE* szPageLength,
                   uint32_t* dwObjNum);
 
   CPDF_DataAvail::DocAvailStatus CheckPage(
-      int index,
+      uint32_t index,
       CPDF_DataAvail::DownloadHints* pHints);
 
   bool LoadHintStream(CPDF_Stream* pHintStream);
@@ -36,7 +36,6 @@ class CPDF_HintTables {
  protected:
   bool ReadPageHintTable(CFX_BitStream* hStream);
   bool ReadSharedObjHintTable(CFX_BitStream* hStream, uint32_t offset);
-  uint32_t GetItemLength(int index, const std::vector<FX_FILESIZE>& szArray);
 
  private:
   // Tests can override.
@@ -50,6 +49,9 @@ class CPDF_HintTables {
   // Helper for the ReadPrimaryHintStream methods above.
   int ReadPrimaryHintStream(int index) const;
 
+  uint32_t GetItemLength(uint32_t index,
+                         const std::vector<FX_FILESIZE>& szArray);
+
   // Owner, outlives this object.
   CPDF_DataAvail* const m_pDataAvail;