Use observed pointers in CPDFSDK_AnnotIterator.

BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build_overrides/v8.gni")
 import("//testing/test.gni")
 import("pdfium.gni")
 
 config("pdfium_common_config") {
   cflags = []
@@ skipping 56 matching lines @@
 static_library("pdfium") {
   sources = [
     "fpdfsdk/cba_annotiterator.cpp",
     "fpdfsdk/cba_annotiterator.h",
     "fpdfsdk/cfx_systemhandler.cpp",
     "fpdfsdk/cfx_systemhandler.h",
     "fpdfsdk/cpdfsdk_annot.cpp",
     "fpdfsdk/cpdfsdk_annot.h",
     "fpdfsdk/cpdfsdk_annothandlermgr.cpp",
     "fpdfsdk/cpdfsdk_annothandlermgr.h",
-    "fpdfsdk/cpdfsdk_annotiterator.cpp",
-    "fpdfsdk/cpdfsdk_annotiterator.h",
+    "fpdfsdk/cpdfsdk_annotiteration.cpp",
+    "fpdfsdk/cpdfsdk_annotiteration.h",
     "fpdfsdk/cpdfsdk_baannot.cpp",
     "fpdfsdk/cpdfsdk_baannot.h",
     "fpdfsdk/cpdfsdk_baannothandler.cpp",
     "fpdfsdk/cpdfsdk_baannothandler.h",
     "fpdfsdk/cpdfsdk_datetime.cpp",
     "fpdfsdk/cpdfsdk_datetime.h",
     "fpdfsdk/cpdfsdk_formfillenvironment.cpp",
     "fpdfsdk/cpdfsdk_formfillenvironment.h",
     "fpdfsdk/cpdfsdk_interform.cpp",
     "fpdfsdk/cpdfsdk_interform.h",
@@ skipping 1742 matching lines @@
       "//samples",
     ]
   }
   group("fuzzers") {
     testonly = true
     deps = [
       "//testing/libfuzzer",
     ]
   }
 }