Allow arbitrary scale factors.

chrome/browser/ui/libgtk2ui/gtk2_ui.cc

 // 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 "chrome/browser/ui/libgtk2ui/gtk2_ui.h"
 
+#include <math.h>
 #include <set>
 
 #include <pango/pango.h>
 
 #include "base/command_line.h"
 #include "base/debug/leak_annotations.h"
 #include "base/environment.h"
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/nix/mime_util_xdg.h"
@@ skipping 1402 matching lines @@
 }
 
 void Gtk2UI::UpdateDeviceScaleFactor(float device_scale_factor) {
   device_scale_factor_ = device_scale_factor;
   GtkStyle* label_style = gtk_rc_get_style(fake_label_.get());
   UpdateDefaultFont(label_style->font_desc);
 }
 
 float Gtk2UI::GetDeviceScaleFactor() const {
   const int kCSSDefaultDPI = 96;
-  const float scale = GetDPI() / kCSSDefaultDPI;
-  return ui::GetScaleForScaleFactor(ui::GetSupportedScaleFactor(scale));
+  float scale = GetDPI() / kCSSDefaultDPI;
+  // Round to 2 decimals, e.g. to 1.33.
+  return roundf(scale * 100) / 100;
 }
 
 }  // namespace libgtk2ui
 
 views::LinuxUI* BuildGtk2UI() {
   return new libgtk2ui::Gtk2UI;
 }