Stop history search going on beyond the start of history....

chrome/browser/dom_ui/dom_ui_contents.cc

 // Copyright (c) 2006-2008 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/dom_ui/dom_ui_contents.h"
 
 #include "chrome/browser/debugger/debugger_contents.h"
 #include "chrome/browser/dom_ui/dev_tools_ui.h"
 #include "chrome/browser/dom_ui/dom_ui.h"
 #include "chrome/browser/dom_ui/downloads_ui.h"
@@ skipping 228 matching lines @@
 
 bool DOMUIContents::InitCurrentUI(bool reload) {
   if (!controller()->GetActiveEntry())
     return false;
 
   GURL url = controller()->GetActiveEntry()->url();
 
   if (url.is_empty() || !url.is_valid())
     return false;
 
-  if (reload || url != current_url_) {
+  if (reload || url.host() != current_url_.host()) {
     // Shut down our existing DOMUI.
     delete current_ui_;
     current_ui_ = NULL;
 
     // Set up a new DOMUI.
     current_ui_ = GetDOMUIForURL(url);
     if (current_ui_) {
       current_ui_->Init();
       current_url_ = url;
       return true;
@@ skipping 30 matching lines @@
     return new DebuggerContents(this);
   }
   if (url.host() == DevToolsUI::GetBaseURL().host()) {
     return new DevToolsUI(this);
   }
 #else
   NOTIMPLEMENTED();
 #endif
   return NULL;
 }