Remove unused CFFL_Notify.

BUILD.gn

 # Copyright 2014 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("//testing/test.gni")
 import("pdfium.gni")
 
 config("pdfium_config") {
   cflags = []
   include_dirs = [ "third_party/freetype/include" ]
@@ skipping 713 matching lines @@
 }
 
 static_library("formfiller") {
   sources = [
     "fpdfsdk/include/formfiller/FFL_CBA_Fontmap.h",
     "fpdfsdk/include/formfiller/FFL_CheckBox.h",
     "fpdfsdk/include/formfiller/FFL_ComboBox.h",
     "fpdfsdk/include/formfiller/FFL_FormFiller.h",
     "fpdfsdk/include/formfiller/FFL_IFormFiller.h",
     "fpdfsdk/include/formfiller/FFL_ListBox.h",
-    "fpdfsdk/include/formfiller/FFL_Notify.h",
     "fpdfsdk/include/formfiller/FFL_PushButton.h",
     "fpdfsdk/include/formfiller/FFL_RadioButton.h",
     "fpdfsdk/include/formfiller/FFL_TextField.h",
     "fpdfsdk/include/formfiller/FFL_Utils.h",
     "fpdfsdk/include/formfiller/FormFiller.h",
     "fpdfsdk/src/formfiller/FFL_CBA_Fontmap.cpp",
     "fpdfsdk/src/formfiller/FFL_CheckBox.cpp",
     "fpdfsdk/src/formfiller/FFL_ComboBox.cpp",
     "fpdfsdk/src/formfiller/FFL_FormFiller.cpp",
     "fpdfsdk/src/formfiller/FFL_IFormFiller.cpp",
     "fpdfsdk/src/formfiller/FFL_ListBox.cpp",
-    "fpdfsdk/src/formfiller/FFL_Notify.cpp",
     "fpdfsdk/src/formfiller/FFL_PushButton.cpp",
     "fpdfsdk/src/formfiller/FFL_RadioButton.cpp",
     "fpdfsdk/src/formfiller/FFL_TextField.cpp",
     "fpdfsdk/src/formfiller/FFL_Utils.cpp",
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":pdfium_config",
     "//build/config/compiler:no_chromium_code",
   ]
@@ skipping 60 matching lines @@
       "//v8",
       "//v8/include",
     ]
   }
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":pdfium_config",
     "//build/config/compiler:no_chromium_code",
   ]
 }