Remove "upgrading to 2x DSF for lower UI scale when 2x resoruces are available" option

ash/display/display_manager_unittest.cc

Index: ash/display/display_manager_unittest.cc
diff --git a/ash/display/display_manager_unittest.cc b/ash/display/display_manager_unittest.cc
index fcd42ba4c00bf2f73d7d38438f386d3617e3e6e6..6080ed6e23b93578f3e946f235584753cd9b21da 100644
--- a/ash/display/display_manager_unittest.cc
+++ b/ash/display/display_manager_unittest.cc
@@ -1065,45 +1065,6 @@ TEST_F(DisplayManagerTest, UIScaleWithDisplayMode) {
       display_manager()->GetActiveModeForDisplayId(display_id)));
 }
 
-TEST_F(DisplayManagerTest, UIScaleUpgradeToHighDPI) {
-  int64 display_id = Shell::GetScreen()->GetPrimaryDisplay().id();
-  gfx::Display::SetInternalDisplayId(display_id);
-  UpdateDisplay("1920x1080");
-
-  DisplayInfo::SetAllowUpgradeToHighDPI(false);
-  display_manager()->SetDisplayUIScale(display_id, 1.125f);
-  EXPECT_EQ(1.0f, GetDisplayInfoAt(0).GetEffectiveDeviceScaleFactor());
-  EXPECT_EQ(1.125f, GetDisplayInfoAt(0).GetEffectiveUIScale());
-  EXPECT_EQ("2160x1215", GetDisplayForId(display_id).size().ToString());
-
-  display_manager()->SetDisplayUIScale(display_id, 0.5f);
-  EXPECT_EQ(1.0f, GetDisplayInfoAt(0).GetEffectiveDeviceScaleFactor());
-  EXPECT_EQ(0.5f, GetDisplayInfoAt(0).GetEffectiveUIScale());
-  EXPECT_EQ("960x540", GetDisplayForId(display_id).size().ToString());
-
-  DisplayInfo::SetAllowUpgradeToHighDPI(true);
-  display_manager()->SetDisplayUIScale(display_id, 1.125f);
-  EXPECT_EQ(1.0f, GetDisplayInfoAt(0).GetEffectiveDeviceScaleFactor());
-  EXPECT_EQ(1.125f, GetDisplayInfoAt(0).GetEffectiveUIScale());
-  EXPECT_EQ("2160x1215", GetDisplayForId(display_id).size().ToString());
-
-  display_manager()->SetDisplayUIScale(display_id, 0.5f);
-  EXPECT_EQ(2.0f, GetDisplayInfoAt(0).GetEffectiveDeviceScaleFactor());
-  EXPECT_EQ(1.0f, GetDisplayInfoAt(0).GetEffectiveUIScale());
-  EXPECT_EQ("960x540", GetDisplayForId(display_id).size().ToString());
-
-  // Upgrade only works on 1.0f DSF.
-  UpdateDisplay("1920x1080*2");
-  display_manager()->SetDisplayUIScale(display_id, 1.125f);
-  EXPECT_EQ(2.0f, GetDisplayInfoAt(0).GetEffectiveDeviceScaleFactor());
-  EXPECT_EQ(1.125f, GetDisplayInfoAt(0).GetEffectiveUIScale());
-  EXPECT_EQ("1080x607", GetDisplayForId(display_id).size().ToString());
-
-  display_manager()->SetDisplayUIScale(display_id, 0.5f);
-  EXPECT_EQ(2.0f, GetDisplayInfoAt(0).GetEffectiveDeviceScaleFactor());
-  EXPECT_EQ(0.5f, GetDisplayInfoAt(0).GetEffectiveUIScale());
-  EXPECT_EQ("480x270", GetDisplayForId(display_id).size().ToString());
-}
 
 TEST_F(DisplayManagerTest, Use125DSFRorUIScaling) {
   int64 display_id = Shell::GetScreen()->GetPrimaryDisplay().id();