[WebIntents] Fix for default service crash.

R=gbillock@chromium.org
BUG=none


Review URL: https://chromiumcodereview.appspot.com/10832332

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152400 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/intents/web_intent_picker_controller.cc

@@ -862,6 +862,8 @@ void WebIntentPickerController::SetDialogState(WebIntentPickerState state) {
       break;
 
     case kPickerHidden:
+      // Once the picker dialog is closed, abandon all pending callbacks.
+      weak_ptr_factory_.InvalidateWeakPtrs();
       break;
 
     default: