Remove ui-enable-dip option

ui/aura/monitor_change_observer_x11.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 "ui/aura/monitor_change_observer_x11.h"
 
 #include <algorithm>
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 94 matching lines @@
     CHECK(mode);
     // Mirrored monitors have the same y coordinates.
     if (y_coords.find(crtc_info->y) != y_coords.end())
       continue;
     // TODO(oshima): Create unique ID for the monitor.
     monitors.push_back(gfx::Monitor(
         0,
         gfx::Rect(crtc_info->x, crtc_info->y, mode->width, mode->height)));
 
     float device_scale_factor = 1.0f;
-    if (ui::IsDIPEnabled() &&
-        output_info->mm_width > 0 &&
+    if (output_info->mm_width > 0 &&
         (kInchInMm * mode->width / output_info->mm_width) >
         kHighDensityDIPThreshold) {
       device_scale_factor = 2.0f;
     }
     monitors.back().set_device_scale_factor(device_scale_factor);
     y_coords.insert(crtc_info->y);
     XRRFreeOutputInfo(output_info);
   }
 
   // Free all allocated resources.
@@ skipping 11 matching lines @@
   for (std::vector<gfx::Monitor>::iterator iter = monitors.begin();
        iter != monitors.end(); ++iter, ++id)
     (*iter).set_id(id);
 
   Env::GetInstance()->monitor_manager()
       ->OnNativeMonitorsChanged(monitors);
 }
 
 }  // namespace internal
 }  // namespace aura