Ensure that extension resources are loaded with the correct scaling applied on Windows.

ui/base/resource/resource_bundle.cc

Index: ui/base/resource/resource_bundle.cc
diff --git a/ui/base/resource/resource_bundle.cc b/ui/base/resource/resource_bundle.cc
index 2c505595cb56365977fb2326f9eab0b20869da7c..7722ddb443e3b43a085655f16067753c47aaeb05 100644
--- a/ui/base/resource/resource_bundle.cc
+++ b/ui/base/resource/resource_bundle.cc
@@ -109,7 +109,7 @@ class ResourceBundle::ResourceBundleImageSource : public gfx::ImageSkiaSource {
     if (!found)
       return gfx::ImageSkiaRep();
 
-    float loaded_image_scale = ui::GetImageScale(scale_factor);
+    float loaded_image_scale = ui::GetImageScaleForScaleFactor(scale_factor);
 
     if (fell_back_to_1x) {
       // GRIT fell back to the 100% image, so rescale it to the correct size.
@@ -353,7 +353,13 @@ gfx::Image& ResourceBundle::GetImageNamed(int resource_id) {
     DCHECK(!data_packs_.empty()) <<
         "Missing call to SetResourcesDataDLL?";
 
-    float scale = PlatformGetImageScale();
+#if defined(OS_CHROMEOS) || defined(OS_WIN)
+  ui::ScaleFactor scale_factor_to_load = GetMaxScaleFactor();
+#else
+  ui::ScaleFactor scale_factor_to_load = ui::SCALE_FACTOR_100P;
+#endif
+
+    float scale = GetImageScale(scale_factor_to_load);
 
     // TODO(oshima): Consider reading the image size from png IHDR chunk and
     // skip decoding here and remove #ifdef below.
@@ -823,15 +829,6 @@ SkBitmap ResourceBundle::PlatformScaleImage(const SkBitmap& image,
                                             float desired_scale) {
   return image;
 }
-
-float ResourceBundle::PlatformGetImageScale() {
-#if defined(OS_CHROMEOS)
-  ui::ScaleFactor scale_factor_to_load = GetMaxScaleFactor();
-#else
-  ui::ScaleFactor scale_factor_to_load = ui::SCALE_FACTOR_100P;
-#endif
-  return GetImageScale(scale_factor_to_load);
-}
 #endif
 
 }  // namespace ui