Upstream most of the iOS WebUI support in ios/web/

ios/public/provider/web/web_ui_ios_controller.cc

Index: ios/public/provider/web/web_ui_ios_controller.cc
diff --git a/ios/public/provider/web/web_ui_ios_controller.cc b/ios/public/provider/web/web_ui_ios_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1909d4f763a119c1175185d3a65ddfc36571e0f3
--- /dev/null
+++ b/ios/public/provider/web/web_ui_ios_controller.cc
@@ -0,0 +1,16 @@
+// 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.
+
+#include "ios/public/provider/web/web_ui_ios_controller.h"
+
+namespace web {
+
+bool WebUIIOSController::OverrideHandleWebUIIOSMessage(
+    const GURL& source_url,
+    const std::string& message,
+    const base::ListValue& args) {
+  return false;
+}
+
+}  // namespace web