Update CPDF_IndirectObjectHolder APIs for unique objects

core/fpdfdoc/cpdf_formfield_unittest.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
 #include "core/fpdfapi/parser/cpdf_indirect_object_holder.h"
 #include "core/fpdfdoc/cpdf_formfield.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 TEST(cpdf_formfield, FPDF_GetFullName) {
   CFX_WideString name = FPDF_GetFullName(nullptr);
   EXPECT_TRUE(name.IsEmpty());
 
   CPDF_IndirectObjectHolder obj_holder;
-  CPDF_Dictionary* root = new CPDF_Dictionary();
-  obj_holder.AddIndirectObject(root);
+  CPDF_Dictionary* root = obj_holder.AddIndirectDictionary();
   root->SetNameFor("T", "foo");
   name = FPDF_GetFullName(root);
   EXPECT_STREQ("foo", name.UTF8Encode().c_str());
 
-  CPDF_Dictionary* dict1 = new CPDF_Dictionary();
-  root->SetReferenceFor("Parent", &obj_holder,
-                        obj_holder.AddIndirectObject(dict1));
+  CPDF_Dictionary* dict1 = obj_holder.AddIndirectDictionary();
+  root->SetReferenceFor("Parent", &obj_holder, dict1);
   dict1->SetNameFor("T", "bar");
   name = FPDF_GetFullName(root);
   EXPECT_STREQ("bar.foo", name.UTF8Encode().c_str());
 
   CPDF_Dictionary* dict2 = new CPDF_Dictionary();
   dict1->SetFor("Parent", dict2);
   name = FPDF_GetFullName(root);
   EXPECT_STREQ("bar.foo", name.UTF8Encode().c_str());
 
-  CPDF_Dictionary* dict3 = new CPDF_Dictionary();
-  dict2->SetReferenceFor("Parent", &obj_holder,
-                         obj_holder.AddIndirectObject(dict3));
+  CPDF_Dictionary* dict3 = obj_holder.AddIndirectDictionary();
+  dict2->SetReferenceFor("Parent", &obj_holder, dict3);
   dict3->SetNameFor("T", "qux");
   name = FPDF_GetFullName(root);
   EXPECT_STREQ("qux.bar.foo", name.UTF8Encode().c_str());
 
   dict3->SetReferenceFor("Parent", &obj_holder, root->GetObjNum());
   name = FPDF_GetFullName(root);
   EXPECT_STREQ("qux.bar.foo", name.UTF8Encode().c_str());
   name = FPDF_GetFullName(dict1);
   EXPECT_STREQ("foo.qux.bar", name.UTF8Encode().c_str());
   name = FPDF_GetFullName(dict2);
   EXPECT_STREQ("bar.foo.qux", name.UTF8Encode().c_str());
   name = FPDF_GetFullName(dict3);
   EXPECT_STREQ("bar.foo.qux", name.UTF8Encode().c_str());
 }