InstantExtended: Fixing a crash when the stale timer could fire after InstantController is deleted.

BUG=232625

Review URL: https://codereview.chromium.org/14161020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194713 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/search/instant_loader.cc

@@ -121,6 +121,7 @@ void InstantLoader::SetContents(scoped_ptr<content::WebContents> new_contents) {
 }
 
 scoped_ptr<content::WebContents> InstantLoader::ReleaseContents() {
+  stale_page_timer_.Stop();
   contents_->SetDelegate(NULL);
 
   // Undo tab helper work done in SetContents().