Remove all PWL_Note classes

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 749 matching lines @@
     "fpdfsdk/pdfwindow/PWL_Icon.cpp",
     "fpdfsdk/pdfwindow/PWL_Icon.h",
     "fpdfsdk/pdfwindow/PWL_IconList.cpp",
     "fpdfsdk/pdfwindow/PWL_IconList.h",
     "fpdfsdk/pdfwindow/PWL_Label.cpp",
     "fpdfsdk/pdfwindow/PWL_Label.h",
     "fpdfsdk/pdfwindow/PWL_ListBox.cpp",
     "fpdfsdk/pdfwindow/PWL_ListBox.h",
     "fpdfsdk/pdfwindow/PWL_ListCtrl.cpp",
     "fpdfsdk/pdfwindow/PWL_ListCtrl.h",
-    "fpdfsdk/pdfwindow/PWL_Note.cpp",
-    "fpdfsdk/pdfwindow/PWL_Note.h",
     "fpdfsdk/pdfwindow/PWL_ScrollBar.cpp",
     "fpdfsdk/pdfwindow/PWL_ScrollBar.h",
     "fpdfsdk/pdfwindow/PWL_Signature.cpp",
     "fpdfsdk/pdfwindow/PWL_Signature.h",
     "fpdfsdk/pdfwindow/PWL_SpecialButton.cpp",
     "fpdfsdk/pdfwindow/PWL_SpecialButton.h",
     "fpdfsdk/pdfwindow/PWL_Utils.cpp",
     "fpdfsdk/pdfwindow/PWL_Utils.h",
     "fpdfsdk/pdfwindow/PWL_Wnd.cpp",
     "fpdfsdk/pdfwindow/PWL_Wnd.h",
@@ skipping 943 matching lines @@
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
     configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_config" ]
 }