Add a CustomSchemeHandler runtime flag to remove ENABLE(CUSTOM_SCHEME_HANDLER)

Source/web/ChromeClientImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 73 matching lines @@
 #include "core/frame/Settings.h"
 #include "core/page/WindowFeatures.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/RenderWidget.h"
 #include "modules/geolocation/Geolocation.h"
 #include "platform/ColorChooser.h"
 #include "platform/ColorChooserClient.h"
 #include "platform/Cursor.h"
 #include "platform/DateTimeChooser.h"
 #include "platform/FileChooser.h"
+#include "platform/NotImplemented.h"
 #include "platform/PlatformScreen.h"
 #include "platform/exported/WrappedResourceRequest.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebCursorInfo.h"
 #include "public/platform/WebRect.h"
 #include "public/platform/WebURLRequest.h"
@@ skipping 919 matching lines @@
 NavigatorContentUtilsClientImpl::NavigatorContentUtilsClientImpl(WebViewImpl* webView)
     : m_webView(webView)
 {
 }
 
 void NavigatorContentUtilsClientImpl::registerProtocolHandler(const String& scheme, const String& baseURL, const String& url, const String& title)
 {
     m_webView->client()->registerProtocolHandler(scheme, baseURL, url, title);
 }
 
+NavigatorContentUtilsClient::CustomHandlersState NavigatorContentUtilsClientImpl::isProtocolHandlerRegistered(const String& scheme, const String& baseURL, const String& url)
+{
+    notImplemented();
+    return NavigatorContentUtilsClient::CustomHandlersDeclined;
+}
+
+void NavigatorContentUtilsClientImpl::unregisterProtocolHandler(const String& scheme, const String& baseURL, const String& url)
+{
+    notImplemented();
+}
+
 } // namespace blink