views/examples: Clean up cpplint warnings.

ui/views/examples/progress_bar_example.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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/views/examples/progress_bar_example.h"
 
+#include <algorithm>
+
 #include "base/utf_string_conversions.h"
 #include "ui/views/controls/button/text_button.h"
 #include "ui/views/controls/progress_bar.h"
 #include "ui/views/layout/grid_layout.h"
 #include "ui/views/view.h"
 
 namespace {
 
 const double kStepSize = 0.1;
 
@@ skipping 44 matching lines @@
   if (sender == minus_button_)
     current_percent_ = ClampToMin(current_percent_ - kStepSize);
   else if (sender == plus_button_)
     current_percent_ = ClampToMin(current_percent_ + kStepSize);
 
   progress_bar_->SetValue(current_percent_);
 }
 
 }  // namespace examples
 }  // namespace views