Bug 1070223: Ignore exceptions thrown from nsIBrowserSearchInitObserver. r=MattN

toolkit/components/search/nsSearchService.js

@@ -3871,10 +3871,14 @@ SearchService.prototype = {
     if (observer) {
       this._initObservers.promise.then(
         function onSuccess() {
-          observer.onInitComplete(self._initRV);
+          try {
+            observer.onInitComplete(self._initRV);
+          } catch (e) {
+            Cu.reportError(e);
+          }
         },
         function onError(aReason) {
-          Components.utils.reportError("Internal error while initializing SearchService: " + aReason);
+          Cu.reportError("Internal error while initializing SearchService: " + aReason);
           observer.onInitComplete(Components.results.NS_ERROR_UNEXPECTED);
         }
       );