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

components/search_engines/template_url.cc

 // Copyright 2014 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 "components/search_engines/template_url.h"
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 1311 matching lines @@
       }
     }
   }
   return false;
 }
 
 bool TemplateURL::ReplaceSearchTermsInURL(
     const GURL& url,
     const TemplateURLRef::SearchTermsArgs& search_terms_args,
     const SearchTermsData& search_terms_data,
-    GURL* result) {
+    GURL* result) const {
   // TODO(beaudoin): Use AQS from |search_terms_args| too.
   url::Parsed::ComponentType search_term_component;
   url::Component search_terms_position;
   base::string16 search_terms;
   if (!FindSearchTermsInURL(url, search_terms_data, &search_terms,
                             &search_term_component, &search_terms_position)) {
     return false;
   }
   DCHECK(search_terms_position.is_nonempty());
 
@@ skipping 158 matching lines @@
       // patterns. This means that given patterns
       //    [ "http://foo/#q={searchTerms}", "http://foo/?q={searchTerms}" ],
       // calling ExtractSearchTermsFromURL() on "http://foo/?q=bar#q=' would
       // return false. This is important for at least Google, where such URLs
       // are invalid.
       return !search_terms->empty();
     }
   }
   return false;
 }