Remove non-const version of GetDefaultSearchProvider() and make all callers call the const version

chrome/browser/policy/policy_browsertest.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 <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
 #include <memory>
 #include <string>
@@ skipping 955 matching lines @@
   const std::string kAlternateURL1("http://search.example/#q={searchTerms}");
   const std::string kSearchTermsReplacementKey("zekey");
   const std::string kImageURL("http://test.com/searchbyimage/upload");
   const std::string kImageURLPostParams(
       "image_content=content,image_url=http://test.com/test.png");
   const std::string kNewTabURL("http://search.example/newtab");
 
   TemplateURLService* service = TemplateURLServiceFactory::GetForProfile(
       browser()->profile());
   search_test_utils::WaitForTemplateURLServiceToLoad(service);
-  TemplateURL* default_search = service->GetDefaultSearchProvider();
+  const TemplateURL* default_search = service->GetDefaultSearchProvider();
   ASSERT_TRUE(default_search);
   EXPECT_NE(kKeyword, default_search->keyword());
   EXPECT_NE(kSearchURL, default_search->url());
   EXPECT_NE(kInstantURL, default_search->instant_url());
   EXPECT_FALSE(
     default_search->alternate_urls().size() == 2 &&
     default_search->alternate_urls()[0] == kAlternateURL0 &&
     default_search->alternate_urls()[1] == kAlternateURL1 &&
     default_search->search_terms_replacement_key() ==
         kSearchTermsReplacementKey &&
@@ skipping 3496 matching lines @@
 
   SetEmptyPolicy();
   // Policy not set.
   CheckSystemTimezoneAutomaticDetectionPolicyUnset();
   EXPECT_TRUE(CheckResolveTimezoneByGeolocation(true, false));
   EXPECT_TRUE(manager->TimeZoneResolverShouldBeRunningForTests());
 }
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace policy