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

chrome/browser/ui/browser.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/browser.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #endif  // defined(OS_WIN)
@@ skipping 1025 matching lines @@
   // Reset the status bubble.
   StatusBubble* status_bubble = GetStatusBubble();
   if (status_bubble) {
     status_bubble->Hide();
 
     // Show the loading state (if any).
     status_bubble->SetStatus(CoreTabHelper::FromWebContents(
         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);
   }
 
   // Update sessions. Don't force creation of sessions. If sessions doesn't
   // exist, the change will be picked up by sessions when created.
   SessionService* session_service =
       SessionServiceFactory::GetForProfileIfExisting(profile_);
   if (session_service && !tab_strip_model_->closing_all()) {
@@ skipping 1418 matching lines @@
   if (contents && !allow_js_access) {
     contents->web_contents()->GetController().LoadURL(
         target_url,
         content::Referrer(),
         content::PAGE_TRANSITION_LINK,
         std::string());  // No extra headers.
   }
 
   return contents != NULL;
 }