Enable hidpi on Linux, refactor a bit on Windows to share

chrome/browser/ui/views/apps/glass_app_window_frame_view_win.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 "chrome/browser/ui/views/apps/glass_app_window_frame_view_win.h"
 
 #include "extensions/browser/app_window/native_app_window.h"
 #include "ui/base/hit_test.h"
-#include "ui/gfx/win/dpi.h"
+#include "ui/gfx/dpi.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace {
 
 const int kResizeAreaCornerSize = 16;
 
 }  // namespace
 
 const char GlassAppWindowFrameViewWin::kViewClassName[] =
@@ skipping 110 matching lines @@
   gfx::Size max_size = widget_->client_view()->GetMaximumSize();
 
   gfx::Insets insets = GetGlassInsets();
   if (max_size.width())
     max_size.Enlarge(insets.left() + insets.right(), 0);
   if (max_size.height())
     max_size.Enlarge(0, insets.top() + insets.bottom());
 
   return max_size;
 }