Make sure we don't "hang" when the bookmarks extension API does not work. Als...

chrome/browser/dom_ui/bookmarks_ui.cc

Index: chrome/browser/dom_ui/bookmarks_ui.cc
===================================================================
--- chrome/browser/dom_ui/bookmarks_ui.cc	(revision 46967)
+++ chrome/browser/dom_ui/bookmarks_ui.cc	(working copy)
@@ -31,11 +31,13 @@
                                              int request_id) {
   NOTREACHED() << "We should never get here since the extension should have"
                << "been triggered";
+
+  SendResponse(request_id, NULL);
 }
 
 std::string BookmarksUIHTMLSource::GetMimeType(const std::string& path) const {
-    NOTREACHED() << "We should never get here since the extension should have"
-                 << "been triggered";
+  NOTREACHED() << "We should never get here since the extension should have"
+               << "been triggered";
   return "text/html";
 }