Cut VrShell dependency on WebUi.

chrome/browser/android/vr_shell/ui_interface.cc

 // 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.
 
 #include "chrome/browser/android/vr_shell/ui_interface.h"
 
 #include "chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.h"
 
 namespace vr_shell {
 
 UiInterface::UiInterface() {
   SetMode(Mode::STANDARD);
 }
 
 UiInterface::~UiInterface() {}
 
-void UiInterface::SetUiMessageHandler(VrShellUIMessageHandler* handler) {
+void UiInterface::SetUiCommandHandler(UiCommandHandler* handler) {
   handler_ = handler;
 }
 
 void UiInterface::SetMode(Mode mode) {
   updates_.SetInteger("mode", static_cast<int>(mode));
   FlushUpdates();
 }
 
 void UiInterface::SetSecureOrigin(bool secure) {
   updates_.SetBoolean("secureOrigin", static_cast<int>(secure));
   FlushUpdates();
 }
 
 void UiInterface::OnDomContentsLoaded() {
   loaded_ = true;
   FlushUpdates();
 }
 
 void UiInterface::FlushUpdates() {
   if (loaded_ && handler_) {
     handler_->SendCommandToUi(updates_);
     updates_.Clear();
   }
 }
 
 }  // namespace vr_shell