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..53a763bbf249bcd27d8fdb7d6f9562fcba9188df 100644
--- a/ui/base/resource/resource_bundle.cc
+++ b/ui/base/resource/resource_bundle.cc
@@ -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)
+  ui::ScaleFactor scale_factor_to_load = GetMaxScaleFactor();
+#else
+  ui::ScaleFactor scale_factor_to_load = ui::SCALE_FACTOR_100P;
+#endif
+
+    float scale = PlatformGetImageScale(scale_factor_to_load);
 
     // TODO(oshima): Consider reading the image size from png IHDR chunk and
     // skip decoding here and remove #ifdef below.
@@ -527,6 +533,14 @@ ScaleFactor ResourceBundle::GetMaxScaleFactor() const {
 #endif
 }
 
+#if !defined(OS_WIN)
+// static
+float ResourceBundle::PlatformGetImageScale(
+    ui::ScaleFactor scale_factor) {
+  return GetImageScale(scale_factor);
+}
+#endif
+
 ResourceBundle::ResourceBundle(Delegate* delegate)
     : delegate_(delegate),
       images_and_fonts_lock_(new base::Lock),
@@ -823,15 +837,6 @@ 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