Reduce usage of FOR_EACH_OBSERVER macro in components/

components/wallpaper/wallpaper_resizer.cc

Index: components/wallpaper/wallpaper_resizer.cc
diff --git a/components/wallpaper/wallpaper_resizer.cc b/components/wallpaper/wallpaper_resizer.cc
index 93640fd33305d605dff063abcaf3e8ef3a016b6e..545a9cc4d000127244175c62a47776a057651ce0 100644
--- a/components/wallpaper/wallpaper_resizer.cc
+++ b/components/wallpaper/wallpaper_resizer.cc
@@ -144,7 +144,8 @@ void WallpaperResizer::RemoveObserver(WallpaperResizerObserver* observer) {
 
 void WallpaperResizer::OnResizeFinished(SkBitmap* resized_bitmap) {
   image_ = gfx::ImageSkia::CreateFrom1xBitmap(*resized_bitmap);
-  FOR_EACH_OBSERVER(WallpaperResizerObserver, observers_, OnWallpaperResized());
+  for (auto& observer : observers_)
+    observer.OnWallpaperResized();
 }
 
 }  // namespace wallpaper