Findbox should disappear once we reload and open new tab and come back to previous tab.

chrome/browser/ui/browser.cc

Index: chrome/browser/ui/browser.cc
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index 12b40d8e3125ecc5104f19b5b2647832dd5d05e7..ef06766276364a91610a76e26aa756647cd75347 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -1043,6 +1043,12 @@ void Browser::ActiveTabChanged(WebContents* old_contents,
         tab_strip_model_->GetActiveWebContents())->GetStatusText());
   }
 
+  if (old_contents) {
+    FindTabHelper* find_tab_helper =
+        FindTabHelper::FromWebContents(old_contents);
+    find_tab_helper->set_isloading_at_tabchange(old_contents->IsLoading());
+  }
+
   if (HasFindBarController()) {
     find_bar_controller_->ChangeWebContents(new_contents);
     find_bar_controller_->find_bar()->MoveWindowIfNecessary(gfx::Rect(), true);