Rename GetElementValue() to GetDirectObject{By,At}().

core/fpdfapi/fpdf_font/cpdf_font.cpp

Index: core/fpdfapi/fpdf_font/cpdf_font.cpp
diff --git a/core/fpdfapi/fpdf_font/cpdf_font.cpp b/core/fpdfapi/fpdf_font/cpdf_font.cpp
index c52ce8ff93a499aa3a12658849516ee4195a2eb2..fd6a9c981452fec3e8ff33ec5fece4c94cbbd4cb 100644
--- a/core/fpdfapi/fpdf_font/cpdf_font.cpp
+++ b/core/fpdfapi/fpdf_font/cpdf_font.cpp
@@ -452,7 +452,7 @@ void CPDF_Font::LoadPDFEncoding(CPDF_Object* pEncoding,
   pCharNames = new CFX_ByteString[256];
   uint32_t cur_code = 0;
   for (uint32_t i = 0; i < pDiffs->GetCount(); i++) {
-    CPDF_Object* pElement = pDiffs->GetElementValue(i);
+    CPDF_Object* pElement = pDiffs->GetDirectObjectAt(i);
     if (!pElement)
       continue;