Add 1.6x mode.

ui/display/manager/managed_display_info.h

Index: ui/display/manager/managed_display_info.h
diff --git a/ui/display/manager/managed_display_info.h b/ui/display/manager/managed_display_info.h
index c40b3c81e17420f3d5e1da7b6e3c6b7b040cb15a..0a2863aaa30718c652fea8b8e501aacb488d6fdb 100644
--- a/ui/display/manager/managed_display_info.h
+++ b/ui/display/manager/managed_display_info.h
@@ -153,11 +153,6 @@ class DISPLAY_MANAGER_EXPORT ManagedDisplayInfo {
   static ManagedDisplayInfo CreateFromSpecWithID(const std::string& spec,
                                                  int64_t id);
 
-  // When this is set to true on the device whose internal display has
-  // 1.25 dsf, Chrome uses 1.0f as a default scale factor, and uses
-  // dsf 1.25 when UI scaling is set to 0.8f.
-  static void SetUse125DSFForUIScalingForTest(bool enable);
-
   ManagedDisplayInfo();
   ManagedDisplayInfo(int64_t id, const std::string& name, bool has_overscan);
   ManagedDisplayInfo(const ManagedDisplayInfo& other);