Unify some code

core/fpdfapi/parser/cpdf_document_unittest.cpp

Index: core/fpdfapi/parser/cpdf_document_unittest.cpp
diff --git a/core/fpdfapi/parser/cpdf_document_unittest.cpp b/core/fpdfapi/parser/cpdf_document_unittest.cpp
index 16d0ade069aa11a0f7c180494888ec5d1a8c5f1c..e20a5a1d1da50e84ced98b5dccf9f130181fec4f 100644
--- a/core/fpdfapi/parser/cpdf_document_unittest.cpp
+++ b/core/fpdfapi/parser/cpdf_document_unittest.cpp
@@ -9,15 +9,13 @@
 #include "core/fpdfapi/cpdf_modulemgr.h"
 #include "core/fpdfapi/parser/cpdf_array.h"
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
+#include "core/fpdfapi/parser/cpdf_linearized.h"
 #include "core/fpdfapi/parser/cpdf_parser.h"
 #include "core/fxcrt/fx_memory.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
-using ScopedDictionary =
-    std::unique_ptr<CPDF_Dictionary, ReleaseDeleter<CPDF_Dictionary>>;
-
 CPDF_Dictionary* CreatePageTreeNode(CPDF_Array* kids,
                                     CPDF_Document* pDoc,
                                     int count) {
@@ -77,6 +75,11 @@ class CPDF_TestDocumentForPages : public CPDF_Document {
  private:
   std::unique_ptr<CPDF_Dictionary> m_pOwnedRootDict;
 };
+
+class TestLinearized : public CPDF_Linearized {
+ public:
+  explicit TestLinearized(CPDF_Dictionary* dict) : CPDF_Linearized(dict) {}
+};
 }  // namespace
 
 class cpdf_document_test : public testing::Test {
@@ -142,10 +145,12 @@ TEST_F(cpdf_document_test, UseCachedPageObjNumIfHaveNotPagesDict) {
   // can be not exists in this case.
   // (case, when hint table is used to page check in CPDF_DataAvail).
   CPDF_Document document(pdfium::MakeUnique<CPDF_Parser>());
-  std::unique_ptr<CPDF_Dictionary> dict(new CPDF_Dictionary());
+  auto dict = pdfium::MakeUnique<CPDF_Dictionary>();
+  dict->SetBooleanFor("Linearized", true);
   const int page_count = 100;
   dict->SetIntegerFor("N", page_count);
-  document.LoadLinearizedDoc(dict.get());
+  TestLinearized linearized(dict.get());
+  document.LoadLinearizedDoc(&linearized);
   ASSERT_EQ(page_count, document.GetPageCount());
   CPDF_Object* page_stub = new CPDF_Dictionary();
   const uint32_t obj_num = document.AddIndirectObject(page_stub);