Blacklist low 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>
@@ skipping 1420 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 {
   if (gfx::Display::HasForceDeviceScaleFactor())
     return gfx::Display::GetForcedDeviceScaleFactor();
   const int kCSSDefaultDPI = 96;
-  float scale = GetDPI() / kCSSDefaultDPI;
+  const float scale = GetDPI() / kCSSDefaultDPI;
   // Round to 1 decimal, e.g. to 1.4.
-  return roundf(scale * 10) / 10;
+  const float rounded = roundf(scale * 10) / 10;
+  // See crbug.com/484400
+  return (rounded < 1.3 ? 1.0 : rounded);

[Evan Stade, 2015/08/28 14:54:11]

nit, no parens

 }
 
 }  // namespace libgtk2ui
 
 views::LinuxUI* BuildGtk2UI() {
   return new libgtk2ui::Gtk2UI;
 }