Remove IsHighDPIEnabled, move EnableHighDPISupport to only place it's used

ash/display/display_info.cc

 // Copyright (c) 2013 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 <stdio.h>
 #include <string>
 #include <vector>
 
 #include "ash/display/display_info.h"
 #include "base/logging.h"
@@ skipping 131 matching lines @@
             rotation = gfx::Display::ROTATE_270;
             break;
         }
       }
     }
   }
 
   float device_scale_factor = 1.0f;
   if (!GetDisplayBounds(main_spec, &bounds_in_native, &device_scale_factor)) {
 #if defined(OS_WIN)
-    if (gfx::IsHighDPIEnabled()) {
-      device_scale_factor = gfx::GetDPIScale();
-    }
+    device_scale_factor = gfx::GetDPIScale();
 #endif
   }
 
   std::vector<DisplayMode> display_modes;
   if (Tokenize(main_spec, "#", &parts) == 2) {
     size_t native_mode = 0;
     int largest_area = -1;
     float highest_refresh_rate = -1.0f;
     main_spec = parts[0];
     std::string resolution_list = parts[1];
@@ skipping 215 matching lines @@
 }
 
 bool DisplayInfo::IsColorProfileAvailable(
     ui::ColorCalibrationProfile profile) const {
   return std::find(available_color_profiles_.begin(),
                    available_color_profiles_.end(),
                    profile) != available_color_profiles_.end();
 }
 
 }  // namespace ash