Adds a new constructor for gfx::Image on iOS.

ui/base/resource/resource_bundle_ios.mm

Index: ui/base/resource/resource_bundle_ios.mm
diff --git a/ui/base/resource/resource_bundle_ios.mm b/ui/base/resource/resource_bundle_ios.mm
index 43a5325f1695e2763c0ea388efb9fdad9d9c087d..6ffb68754d951fbf4d553b23602034f41d42b930 100644
--- a/ui/base/resource/resource_bundle_ios.mm
+++ b/ui/base/resource/resource_bundle_ios.mm
@@ -163,7 +163,7 @@ gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id) {
     }
 
     // The gfx::Image takes ownership.
-    image = gfx::Image(ui_image.release());
+    image = gfx::Image(ui_image, base::scoped_policy::RETAIN);
   }
 
   base::AutoLock lock(*images_and_fonts_lock_);