Bug 1217357 - Update broken call to getContentWindow() from larch merge. r=kevingrandon

--HG--
extra : rebase_source : b5f329530cfe38d70ce7fed6d5b2028c4919d99a

b2g/chrome/content/shell.js

@@ -105,9 +105,9 @@ function clearCache() {
 
 function clearCacheAndReload() {
   // Reload the main frame with a cleared cache.
-  debug('Reloading ' + getContentWindow().location);
+  debug('Reloading ' + shell.contentBrowser.contentWindow.location);
   clearCache();
-  getContentWindow().location.reload(true);
+  shell.contentBrowser.contentWindow.location.reload(true);
   once('mozbrowserlocationchange').then(
     evt => {
       shell.sendEvent(window, "ContentStart");