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

ui/base/resource/resource_bundle_win.cc

Index: ui/base/resource/resource_bundle_win.cc
diff --git a/ui/base/resource/resource_bundle_win.cc b/ui/base/resource/resource_bundle_win.cc
index 5e0fd2214f4d0bbed79545e5cf3de8bebebc80e7..13f74e032f8e8adfea53f766ff86d2a15d4b4a69 100644
--- a/ui/base/resource/resource_bundle_win.cc
+++ b/ui/base/resource/resource_bundle_win.cc
@@ -93,12 +93,6 @@ SkBitmap ResourceBundle::PlatformScaleImage(const SkBitmap& image,
   return scaled_image;
 }
 
-float ResourceBundle::PlatformGetImageScale() {
-  if (!gfx::IsHighDPIEnabled())
-    return ui::GetImageScale(GetMaxScaleFactor());
-  return gfx::win::GetDeviceScaleFactor();
-}
-
 void SetResourcesDataDLL(HINSTANCE handle) {
   resources_data_dll = handle;
 }