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

chrome/browser/search_engines/template_url_service_sync_unittest.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 <memory>
 #include <utility>
 
 #include "base/macros.h"
@@ skipping 2402 matching lines @@
   // Now test that a remote TemplateURL can override the attributes of the local
   // default search provider.
   TemplateURL* existing_default = new TemplateURL(data);
   model()->Add(base::WrapUnique(existing_default));
   model()->SetUserSelectedDefaultSearchProvider(existing_default);
 
   merge_result = model()->MergeDataAndStartSyncing(
       syncer::SEARCH_ENGINES, list, PassProcessor(),
       CreateAndPassSyncErrorFactory());
 
-  result_turl = model()->GetDefaultSearchProvider();
-  EXPECT_TRUE(result_turl);
-  EXPECT_EQ(ASCIIToUTF16("new_kw"), result_turl->keyword());
-  EXPECT_EQ(ASCIIToUTF16("my name"), result_turl->short_name());
-  EXPECT_EQ(default_turl->url(), result_turl->url());
+  const TemplateURL* final_turl = model()->GetDefaultSearchProvider();
+  EXPECT_TRUE(final_turl);
+  EXPECT_EQ(ASCIIToUTF16("new_kw"), final_turl->keyword());
+  EXPECT_EQ(ASCIIToUTF16("my name"), final_turl->short_name());
+  EXPECT_EQ(default_turl->url(), final_turl->url());
 }
 
 TEST_F(TemplateURLServiceSyncTest, MergeNonEditedPrepopulatedEngine) {
   std::unique_ptr<TemplateURLData> default_turl(
       TemplateURLPrepopulateData::GetPrepopulatedDefaultSearch(NULL));
 
   TemplateURLData data(*default_turl);
   data.safe_for_autoreplace = true;  // Can be replaced with built-in values.
   data.SetKeyword(ASCIIToUTF16("new_kw"));
   data.SetShortName(ASCIIToUTF16("my name"));
@@ skipping 43 matching lines @@
 
 TEST_F(TemplateURLServiceSyncTest, NonAsciiKeywordDoesNotCrash) {
   model()->Add(CreateTestTemplateURL(UTF8ToUTF16("\xf0\xaf\xa6\x8d"),
                                      "http://key1.com"));
   syncer::SyncDataList initial_data = CreateInitialSyncData();
 
   model()->MergeDataAndStartSyncing(
       syncer::SEARCH_ENGINES, initial_data, PassProcessor(),
       CreateAndPassSyncErrorFactory());
 }