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

chrome/browser/ui/find_bar/find_bar_controller.cc

 // Copyright (c) 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/find_bar/find_bar_controller.h"
 
 #include <algorithm>
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
@@ skipping 94 matching lines @@
   registrar_.Add(this,
                  chrome::NOTIFICATION_FIND_RESULT_AVAILABLE,
                  content::Source<WebContents>(web_contents_));
   registrar_.Add(
       this,
       content::NOTIFICATION_NAV_ENTRY_COMMITTED,
       content::Source<NavigationController>(&web_contents_->GetController()));
 
   MaybeSetPrepopulateText();
 
+  // Disappearing Findbox.
+  if (find_tab_helper && find_tab_helper->isloading_at_tabchange()) {
+    find_tab_helper->set_isloading_at_tabchange(false);
+    EndFindSession(kKeepSelectionOnPage, kClearResultsInFindBox);
+    return;
+  }
+
   if (find_tab_helper && find_tab_helper->find_ui_active()) {
     // A tab with a visible find bar just got selected and we need to show the
     // find bar but without animation since it was already animated into its
     // visible state. We also want to reset the window location so that
     // we don't surprise the user by popping up to the left for no apparent
     // reason.
     find_bar_->Show(false);
   }
 
   UpdateFindBarForCurrentResult();
@@ skipping 135 matching lines @@
   }
 
   // Update the find bar with existing results and search text, regardless of
   // whether or not the find bar is visible, so that if it's subsequently
   // shown it is showing the right state for this tab. We update the find text
   // _first_ since the FindBarView checks its emptiness to see if it should
   // clear the result count display when there's nothing in the box.
   find_bar_->SetFindTextAndSelectedRange(find_string,
                                          find_tab_helper->selected_range());
 }