Fixes for re-enabling more MSVC level 4 warnings: mojo/ edition

mojo/services/public/cpp/view_manager/lib/node.cc

 // 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 "mojo/services/public/cpp/view_manager/node.h"
 
 #include "mojo/services/public/cpp/view_manager/lib/node_private.h"
 #include "mojo/services/public/cpp/view_manager/lib/view_manager_client_impl.h"
 #include "mojo/services/public/cpp/view_manager/lib/view_private.h"
 #include "mojo/services/public/cpp/view_manager/node_observer.h"
@@ skipping 354 matching lines @@
 
 void Node::Embed(const String& url) {
   static_cast<ViewManagerClientImpl*>(manager_)->Embed(url, id_);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Node, protected:
 
 Node::Node()
     : manager_(NULL),
-      id_(-1),
+      id_(static_cast<Id>(-1)),
       parent_(NULL),
       active_view_(NULL) {}
 
 Node::~Node() {
   ScopedDestructionNotifier notifier(this);
   if (parent_)
     parent_->LocalRemoveChild(this);
   // TODO(beng): It'd be better to do this via a destruction observer in the
   //             ViewManagerClientImpl.
   if (manager_)
@@ skipping 42 matching lines @@
 
 void Node::LocalSetBounds(const gfx::Rect& old_bounds,
                           const gfx::Rect& new_bounds) {
   DCHECK(old_bounds == bounds_);
   ScopedSetBoundsNotifier notifier(this, old_bounds, new_bounds);
   bounds_ = new_bounds;
 }
 
 }  // namespace view_manager
 }  // namespace mojo