ozone: caca: Fix the build

ui/ozone/platform/dri/chromeos/native_display_delegate_dri.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 "ui/ozone/platform/dri/chromeos/native_display_delegate_dri.h"
 
 #include "ui/ozone/platform/dri/chromeos/display_mode_dri.h"
 #include "ui/ozone/platform/dri/chromeos/display_snapshot_dri.h"
 #include "ui/ozone/platform/dri/dri_surface_factory.h"
 #include "ui/ozone/platform/dri/dri_util.h"
 #include "ui/ozone/platform/dri/dri_wrapper.h"
 
 namespace ui {
 
 namespace {
-const int kMaxDisplayCount = 2;
+const size_t kMaxDisplayCount = 2;
 }  // namespace
 
 NativeDisplayDelegateDri::NativeDisplayDelegateDri(
     DriSurfaceFactory* surface_factory)
     : surface_factory_(surface_factory) {}
 
 NativeDisplayDelegateDri::~NativeDisplayDelegateDri() {}
 
 void NativeDisplayDelegateDri::Initialize() {
   gfx::SurfaceFactoryOzone::HardwareState state =
@@ skipping 121 matching lines @@
 
 void NativeDisplayDelegateDri::AddObserver(NativeDisplayObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void NativeDisplayDelegateDri::RemoveObserver(NativeDisplayObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 }  // namespace ui