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

chrome/browser/android/locale/special_locale_handler.cc

 // Copyright (c) 2016 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/android/locale/special_locale_handler.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/jni_weak_ref.h"
 #include "base/memory/ptr_util.h"
@@ skipping 82 matching lines @@
       template_url_service_->Remove(turl);
     }
     prepopulate_ids_.pop_back();
   }
 }
 
 void SpecialLocaleHandler::OverrideDefaultSearchProvider(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj) {
   // If the user has changed their default search provider, no-op.
-  TemplateURL* current_dsp = template_url_service_->GetDefaultSearchProvider();
+  const TemplateURL* current_dsp =
+      template_url_service_->GetDefaultSearchProvider();
   if (!current_dsp ||
       current_dsp->prepopulate_id() != TemplateURLPrepopulateData::google.id) {
     return;
   }
 
   TemplateURL* turl = FindURLByPrepopulateID(
       template_url_service_->GetTemplateURLs(), GetDesignatedSearchEngine());
   if (turl) {
     template_url_service_->SetUserSelectedDefaultSearchProvider(turl);
   }
 }
 
 void SpecialLocaleHandler::SetGoogleAsDefaultSearch(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj) {
   // If the user has changed their default search provider, no-op.
-  TemplateURL* current_dsp = template_url_service_->GetDefaultSearchProvider();
+  const TemplateURL* current_dsp =
+      template_url_service_->GetDefaultSearchProvider();
   if (!current_dsp ||
       current_dsp->prepopulate_id() != GetDesignatedSearchEngine()) {
     return;
   }
 
   TemplateURL* turl =
       FindURLByPrepopulateID(template_url_service_->GetTemplateURLs(),
                              TemplateURLPrepopulateData::google.id);
   if (turl) {
     template_url_service_->SetUserSelectedDefaultSearchProvider(turl);
   }
 }
 
 std::vector<std::unique_ptr<TemplateURLData>>
 SpecialLocaleHandler::GetLocalPrepopulatedEngines(Profile* profile) {
   return TemplateURLPrepopulateData::GetLocalPrepopulatedEngines(
       locale_, profile_->GetPrefs());
 }
 
 int SpecialLocaleHandler::GetDesignatedSearchEngine() {
   return TemplateURLPrepopulateData::sogou.id;
 }
 
 SpecialLocaleHandler::~SpecialLocaleHandler() {}
 
 // static
 bool RegisterSpecialLocaleHandler(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }