Revert of Disable the image notification property on MacOS

content/child/runtime_features.cc

Index: content/child/runtime_features.cc
diff --git a/content/child/runtime_features.cc b/content/child/runtime_features.cc
index 5db3dab8ffc80f815d73cc18af7fdfc0518e57eb..b783df3bdd63ad83df54c5ef83fcb5d74ad293b0 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -67,11 +67,6 @@
 // otherwise.
 #if defined(OS_CHROMEOS) || defined(OS_ANDROID) || defined(OS_MACOSX)
   WebRuntimeFeatures::enableWebBluetooth(true);
-#endif
-
-// The Notification Center on Mac OS X does not support content images.
-#if defined(OS_MACOSX)
-  WebRuntimeFeatures::enableNotificationContentImage(false);
 #endif
 }