Continue splitting pageint.h into per-class files

testing/libfuzzer/pdf_streamparser_fuzzer.cc

 // Copyright 2016 The 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 <cstdint>
 #include <memory>
 
-#include "core/fpdfapi/page/pageint.h"
+#include "core/fpdfapi/page/cpdf_streamparser.h"
 #include "core/fpdfapi/parser/cpdf_object.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   CPDF_StreamParser parser(data, size);
   while (std::unique_ptr<CPDF_Object> pObj = parser.ReadNextObject(true, 0))
     continue;
 
   return 0;
 }