ObserverList::HasObserver now takes a const pointer.

chrome/browser/search/instant_unittest_base.cc

 // Copyright 2013 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/instant_unittest_base.h"
 
 #include <string>
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 60 matching lines @@
   // GoogleURLTracker is not created in tests.
   // (See GoogleURLTrackerFactory::ServiceIsNULLWhileTesting())
   // For determining google:baseURL for NTP, the following is used:
   // UIThreadSearchTermsData::GoogleBaseURLValue()
   // For simulating test behavior, this is overridden below.
   UIThreadSearchTermsData::SetGoogleBaseURL(new_google_base_url);
   TemplateURLServiceFactory::GetForProfile(profile())->GoogleBaseURLChanged();
 }
 
 bool InstantUnitTestBase::IsInstantServiceObserver(
-    InstantServiceObserver* observer) {
+    const InstantServiceObserver* observer) const {
   return instant_service_->observers_.HasObserver(observer);
 }
 
 TestingProfile* InstantUnitTestBase::CreateProfile() {
   TestingProfile* profile = BrowserWithTestWindowTest::CreateProfile();
   TemplateURLServiceFactory::GetInstance()->SetTestingFactoryAndUse(
       profile, &TemplateURLServiceFactory::BuildInstanceFor);
   return profile;
 }
 
 void InstantUnitTestBase::SetUpHelper() {
   BrowserWithTestWindowTest::SetUp();
 
   template_url_service_ = TemplateURLServiceFactory::GetForProfile(profile());
   ui_test_utils::WaitForTemplateURLServiceToLoad(template_url_service_);
 
   UIThreadSearchTermsData::SetGoogleBaseURL("https://www.google.com/");
   TestingPrefServiceSyncable* pref_service = profile()->GetTestingPrefService();
   pref_service->SetUserPref(prefs::kLastPromptedGoogleURL,
                             new base::StringValue("https://www.google.com/"));
   SetUserSelectedDefaultSearchProvider("{google:baseURL}");
   instant_service_ = InstantServiceFactory::GetForProfile(profile());
 }