Bug 1574190 - Add watchpoints trait to browsingContextTargetPrototype and remove from RootActor r=jlast

Differential Revision: https://phabricator.services.mozilla.com/D45206

--HG--
extra : moz-landing-system : lando

devtools/server/actors/root.js

@@ -182,8 +182,6 @@ RootActor.prototype = {
     nativeLogpoints: true,
     // support older browsers for Fx69+
     hasThreadFront: true,
-    // Support watchpoints in the server for Fx71+
-    watchpoints: true,
   },
 
   /**

devtools/server/actors/targets/browsing-context.js

@@ -282,6 +282,8 @@ const browsingContextTargetPrototype = {
       logInPage: true,
       // Supports requests related to rewinding.
       canRewind,
+      // Supports watchpoints in the server for Fx71+
+      watchpoints: true,
     };
 
     this._workerTargetActorList = null;