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

chrome/browser/android/contextualsearch/contextual_search_delegate.cc

 // Copyright 2015 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/contextualsearch/contextual_search_delegate.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/base64.h"
@@ skipping 227 matching lines @@
       quick_action_category));
 }
 
 std::string ContextualSearchDelegate::BuildRequestUrl(
     std::string home_country) {
   if (!template_url_service_ ||
       !template_url_service_->GetDefaultSearchProvider()) {
     return std::string();
   }
 
-  TemplateURL* template_url = template_url_service_->GetDefaultSearchProvider();
+  const TemplateURL* template_url =
+      template_url_service_->GetDefaultSearchProvider();
 
   TemplateURLRef::SearchTermsArgs search_terms_args =
       TemplateURLRef::SearchTermsArgs(base::string16());
 
   int contextual_cards_version = kContextualCardsBarIntegration;
   if (base::FeatureList::IsEnabled(
           chrome::android::kContextualSearchSingleActions)) {
     contextual_cards_version = kContextualCardsSingleAction;
   }
   if (base::FeatureList::IsEnabled(
@@ skipping 107 matching lines @@
 bool ContextualSearchDelegate::CanSendPageURL(
     const GURL& current_page_url,
     Profile* profile,
     TemplateURLService* template_url_service) {
   // Check whether there is a Finch parameter preventing us from sending the
   // page URL.
   if (field_trial_->IsSendBasePageURLDisabled())
     return false;
 
   // Ensure that the default search provider is Google.
-  TemplateURL* default_search_provider =
+  const TemplateURL* default_search_provider =
       template_url_service->GetDefaultSearchProvider();
   bool is_default_search_provider_google =
       default_search_provider &&
       default_search_provider->url_ref().HasGoogleBaseURLs(
           template_url_service->search_terms_data());
   if (!is_default_search_provider_google)
     return false;
 
   // Only allow HTTP URLs or HTTPS URLs.
   if (current_page_url.scheme() != url::kHttpScheme &&
@@ skipping 168 matching lines @@
     end_offset -= trim;
   }
   if (result_text.length() > end_offset + padding_each_side_pinned) {
     // Trim the end.
     result_text = result_text.substr(0, end_offset + padding_each_side_pinned);
   }
   *start = start_offset;
   *end = end_offset;
   return result_text;
 }