DevTools: instrument user callbacks based on generic probes, remove NativeBreakpoint.

third_party/WebKit/Source/modules/notifications/Notification.cpp

Index: third_party/WebKit/Source/modules/notifications/Notification.cpp
diff --git a/third_party/WebKit/Source/modules/notifications/Notification.cpp b/third_party/WebKit/Source/modules/notifications/Notification.cpp
index 0486b73f9ec0582c43109224ab8e45479a510b45..64931d3bed3380a91d6ddc97843b991d18e237d0 100644
--- a/third_party/WebKit/Source/modules/notifications/Notification.cpp
+++ b/third_party/WebKit/Source/modules/notifications/Notification.cpp
@@ -380,7 +380,7 @@ ScriptPromise Notification::requestPermission(
         "Only request notification permission in response to a user gesture.",
         0, nullptr);
   }
-  probe::breakIfNeeded(context, "Notification.requestPermission");
+  probe::breakableLocation(context, "Notification.requestPermission");
 
   return NotificationManager::from(context)->requestPermission(
       scriptState, deprecatedCallback);