Bug 1520972 - return setOptionsRequester. r=bhackett

Differential Revision: https://phabricator.services.mozilla.com/D18770

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

devtools/shared/client/breakpoint-client.js

@@ -68,8 +68,8 @@ BreakpointClient.prototype = {
    */
   setOptions: function(options) {
     if (this._client.mainRoot.traits.nativeLogpoints) {
-      this.setOptionsRequester(options);
-    } else {
+      return this.setOptionsRequester(options).then(() => this);
+    }
     // Older servers need to reinstall breakpoints when the condition changes.
     const deferred = promise.defer();
 
@@ -91,7 +91,7 @@ BreakpointClient.prototype = {
         return newBreakpoint;
       }));
     });
-    }
+    return deferred;
   },
 };