Use "Dictionary" for PositionOptions instead of Custom binding

Source/bindings/v8/custom/custom.gypi

 # 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.
 
 {
     'variables': {
         'bindings_v8_custom_dir': '.',
         'bindings_v8_custom_files': [
             'V8ArrayBufferCustom.cpp',
             'V8ArrayBufferCustom.h',
@@ skipping 22 matching lines @@
             'V8ElementCustom.cpp',
             'V8EntryCustom.cpp',
             'V8EntrySyncCustom.cpp',
             'V8ErrorEventCustom.cpp',
             'V8EventCustom.cpp',
             'V8EventTargetCustom.cpp',
             'V8FileCustom.cpp',
             'V8FileReaderCustom.cpp',
             'V8Float32ArrayCustom.h',
             'V8Float64ArrayCustom.h',
-            'V8GeolocationCustom.cpp',
             'V8HTMLAllCollectionCustom.cpp',
             'V8HTMLCanvasElementCustom.cpp',
             'V8HTMLCollectionCustom.cpp',
             'V8HTMLDocumentCustom.cpp',
             'V8HTMLElementCustom.cpp',
             'V8HTMLOptionsCollectionCustom.cpp',
             'V8HTMLPlugInElementCustom.cpp',
             'V8HistoryCustom.cpp',
             'V8ImageDataCustom.cpp',
             'V8InjectedScriptHostCustom.cpp',
@@ skipping 30 matching lines @@
             'V8WebGLRenderingContextCustom.cpp',
             'V8WebKitPointCustom.cpp',
             'V8WindowCustom.cpp',
             'V8WorkerCustom.cpp',
             'V8WorkerGlobalScopeCustom.cpp',
             'V8XMLHttpRequestCustom.cpp',
             'V8XSLTProcessorCustom.cpp',
         ],
     },
 }