Clean-up coding style at apps folder

apps/app_window.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 "apps/app_window.h"
 
 #include <algorithm>
+#include <string>
+#include <vector>
 
 #include "apps/app_window_geometry_cache.h"
 #include "apps/app_window_registry.h"
 #include "apps/apps_client.h"
 #include "apps/size_constraints.h"
 #include "apps/ui/native_app_window.h"
 #include "apps/ui/web_contents_sizer.h"
 #include "base/command_line.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 1135 matching lines @@
         region.bounds.x(),
         region.bounds.y(),
         region.bounds.right(),
         region.bounds.bottom(),
         region.draggable ? SkRegion::kUnion_Op : SkRegion::kDifference_Op);
   }
   return sk_region;
 }
 
 }  // namespace apps