Fix remote frame origin access in ContentWatcher::NotifyBrowserOfChange.

extensions/renderer/content_watcher.cc

Index: extensions/renderer/content_watcher.cc
diff --git a/extensions/renderer/content_watcher.cc b/extensions/renderer/content_watcher.cc
index d16f356c5f637531e00ffe22834f2d08308977b8..7cb1851fa6ef287536accdeb7390e04f76891d1f 100644
--- a/extensions/renderer/content_watcher.cc
+++ b/extensions/renderer/content_watcher.cc
@@ -97,7 +97,7 @@ void ContentWatcher::NotifyBrowserOfChange(
   std::set<base::StringPiece> transitive_selectors;
   for (blink::WebFrame* frame = top_frame; frame;
        frame = frame->traverseNext(/*wrap=*/false)) {
-    if (top_origin.canAccess(frame->document().securityOrigin())) {
+    if (top_origin.canAccess(frame->securityOrigin())) {
       std::map<blink::WebFrame*, std::set<std::string> >::const_iterator
           frame_selectors = matching_selectors_.find(frame);
       if (frame_selectors != matching_selectors_.end()) {