Remove instant confirmation dialog that is displayed the first time the instant checkbox is clicked.

chrome/browser/search/search.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/search/search.h"
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
@@ skipping 329 matching lines @@
 }
 
 bool ShouldAssignURLToInstantRenderer(const GURL& url, Profile* profile) {
   return url.is_valid() &&
          profile &&
          (url.SchemeIs(chrome::kChromeSearchScheme) ||
           IsInstantURL(url, profile));
 }
 
 void RegisterInstantUserPrefs(PrefRegistrySyncable* registry) {
-  registry->RegisterBooleanPref(prefs::kInstantConfirmDialogShown, false,
-                                PrefRegistrySyncable::SYNCABLE_PREF);
   registry->RegisterBooleanPref(prefs::kInstantEnabled, false,
                                 PrefRegistrySyncable::SYNCABLE_PREF);
   // This default is overridden by SetInstantExtendedPrefDefault().
   registry->RegisterBooleanPref(prefs::kInstantExtendedEnabled, false,
                                 PrefRegistrySyncable::SYNCABLE_PREF);
 }
 
 const char* GetInstantPrefName() {
   return IsInstantExtendedAPIEnabled() ? prefs::kInstantExtendedEnabled :
                                          prefs::kInstantEnabled;
@@ skipping 236 matching lines @@
   replacements.SetHostStr(search_host);
   replacements.SetPortStr(search_port);
   return instant_url.ReplaceComponents(replacements);
 }
 
 bool MatchesOriginAndPath(const GURL& my_url, const GURL& other_url) {
   return MatchesOrigin(my_url, other_url) && my_url.path() == other_url.path();
 }
 
 }  // namespace chrome