Bug 1031094 - Uninstalling a collection web result unpins it from collections. r=kgrandon

I think it would be good to wait for the icon by the identifier. Actually you might be able to just call this one-liner instead of having a waitFor here:
```
// Identifier should either come from getAttribute, or potentially be hard-coded because I believe this is stub data.
collection.getIconByIdentifier(indentifier);
```