Use string pools in some dictionaries

fpdfsdk/cpdfsdk_widget.cpp

Index: fpdfsdk/cpdfsdk_widget.cpp
diff --git a/fpdfsdk/cpdfsdk_widget.cpp b/fpdfsdk/cpdfsdk_widget.cpp
index d4fc5c790022acc04fb23fa21deb8f5ee9b45d76..89d581e89104f4de959a52a2dc92fbc2e063165b 100644
--- a/fpdfsdk/cpdfsdk_widget.cpp
+++ b/fpdfsdk/cpdfsdk_widget.cpp
@@ -1815,9 +1815,6 @@ CPWL_Color CPDFSDK_Widget::GetFillPWLColor() const {
 
 void CPDFSDK_Widget::AddImageToAppearance(const CFX_ByteString& sAPType,
                                           CPDF_Stream* pImage) {
-  CPDF_Document* pDoc = m_pPageView->GetPDFDocument();
-  ASSERT(pDoc);
-
   CPDF_Dictionary* pAPDict = m_pAnnot->GetAnnotDict()->GetDictFor("AP");
   CPDF_Stream* pStream = pAPDict->GetStreamFor(sAPType);
   CPDF_Dictionary* pStreamDict = pStream->GetDict();
@@ -1829,17 +1826,16 @@ void CPDFSDK_Widget::AddImageToAppearance(const CFX_ByteString& sAPType,
       sImageAlias = "IMG";
   }
 
+  CPDF_Document* pDoc = m_pPageView->GetPDFDocument();
   CPDF_Dictionary* pStreamResList = pStreamDict->GetDictFor("Resources");
   if (!pStreamResList) {
-    pStreamResList = new CPDF_Dictionary();
+    pStreamResList = new CPDF_Dictionary(pDoc->GetByteStringPool());
     pStreamDict->SetFor("Resources", pStreamResList);
   }
 
-  if (pStreamResList) {
-    CPDF_Dictionary* pXObject = new CPDF_Dictionary;
-    pXObject->SetReferenceFor(sImageAlias, pDoc, pImage);
-    pStreamResList->SetFor("XObject", pXObject);
-  }
+  CPDF_Dictionary* pXObject = new CPDF_Dictionary(pDoc->GetByteStringPool());
+  pXObject->SetReferenceFor(sImageAlias, pDoc, pImage);
+  pStreamResList->SetFor("XObject", pXObject);
 }
 
 void CPDFSDK_Widget::RemoveAppearance(const CFX_ByteString& sAPType) {