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

ui/base/resource/resource_bundle_unittest.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/base/resource/resource_bundle.h"
 
 #include "base/base_paths.h"
 #include "base/big_endian.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 455 matching lines @@
   EXPECT_EQ("this is id 6", resource_bundle->GetRawDataResourceForScale(6,
       SCALE_FACTOR_100P));
   EXPECT_EQ("this is id 6", resource_bundle->GetRawDataResourceForScale(6,
       SCALE_FACTOR_200P));
 }
 
 // Test requesting image reps at various scale factors from the image returned
 // via ResourceBundle::GetImageNamed().
 TEST_F(ResourceBundleImageTest, GetImageNamed) {
 #if defined(OS_WIN)
-  gfx::ForceHighDPISupportForTesting(2.0);
+  gfx::InitDeviceScaleFactor(2.0);
 #endif
   std::vector<ScaleFactor> supported_factors;
   supported_factors.push_back(SCALE_FACTOR_100P);
   supported_factors.push_back(SCALE_FACTOR_200P);
   test::ScopedSetSupportedScaleFactors scoped_supported(supported_factors);
   base::FilePath data_1x_path = dir_path().AppendASCII("sample_1x.pak");
   base::FilePath data_2x_path = dir_path().AppendASCII("sample_2x.pak");
 
   // Create the pak files.
   CreateDataPackWithSingleBitmap(data_1x_path, 10, base::StringPiece());
@@ skipping 134 matching lines @@
   resource_bundle->AddDataPackFromPath(data_default_path, SCALE_FACTOR_NONE);
 
   gfx::ImageSkia* image_skia = resource_bundle->GetImageSkiaNamed(3);
   EXPECT_EQ(1u, image_skia->image_reps().size());
   EXPECT_TRUE(image_skia->image_reps()[0].unscaled());
   EXPECT_EQ(ui::SCALE_FACTOR_100P,
             GetSupportedScaleFactor(image_skia->image_reps()[0].scale()));
 }
 
 }  // namespace ui