Remove Release() from IFXCRT_FileAccess

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_config") {
   cflags = []
@@ skipping 596 matching lines @@
     "core/fxcrt/fx_basic_utf.cpp",
     "core/fxcrt/fx_basic_util.cpp",
     "core/fxcrt/fx_basic_wstring.cpp",
     "core/fxcrt/fx_bidi.cpp",
     "core/fxcrt/fx_bidi.h",
     "core/fxcrt/fx_extension.cpp",
     "core/fxcrt/fx_ucddata.cpp",
     "core/fxcrt/fx_unicode.cpp",
     "core/fxcrt/fx_xml_composer.cpp",
     "core/fxcrt/fx_xml_parser.cpp",
-    "core/fxcrt/fxcrt_platforms.cpp",
-    "core/fxcrt/fxcrt_platforms.h",
     "core/fxcrt/fxcrt_posix.cpp",
     "core/fxcrt/fxcrt_posix.h",
     "core/fxcrt/fxcrt_stream.cpp",
     "core/fxcrt/fxcrt_windows.cpp",
     "core/fxcrt/fxcrt_windows.h",
     "core/fxcrt/include/cfx_retain_ptr.h",
     "core/fxcrt/include/fx_basic.h",
     "core/fxcrt/include/fx_coordinates.h",
     "core/fxcrt/include/fx_ext.h",
     "core/fxcrt/include/fx_memory.h",
@@ skipping 1081 matching lines @@
 }
 
 if (pdf_is_standalone) {
   source_set("samples") {
     testonly = true
     deps = [
       "//samples",
     ]
   }
 }