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

ui/accessibility/ax_node_data.cc

 // Copyright 2013 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 "ui/accessibility/ax_node_data.h"
 
 #include <set>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 14 matching lines @@
     str += IntToString(items[i]);
   }
   return str;
 }
 
 }  // Anonymous namespace
 
 AXNodeData::AXNodeData()
     : id(-1),
       role(AX_ROLE_UNKNOWN),
-      state(-1) {
+      state(0xFFFFFFFF) {
 }
 
 AXNodeData::~AXNodeData() {
 }
 
 void AXNodeData::AddStringAttribute(
     AXStringAttribute attribute, const std::string& value) {
   string_attributes.push_back(std::make_pair(attribute, value));
 }
 
@@ skipping 346 matching lines @@
     }
   }
 
   if (!child_ids.empty())
     result += " child_ids=" + IntVectorToString(child_ids);
 
   return result;
 }
 
 }  // namespace ui