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

components/search_engines/template_url.h

 // 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.
 
 #ifndef COMPONENTS_SEARCH_ENGINES_TEMPLATE_URL_H_
 #define COMPONENTS_SEARCH_ENGINES_TEMPLATE_URL_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 653 matching lines @@
 
   // Given a |url| corresponding to this TemplateURL, identifies the search
   // terms and replaces them with the ones in |search_terms_args|, leaving the
   // other parameters untouched. If the replacement fails, returns false and
   // leaves |result| untouched. This is used by mobile ports to perform query
   // refinement.
   bool ReplaceSearchTermsInURL(
       const GURL& url,
       const TemplateURLRef::SearchTermsArgs& search_terms_args,
       const SearchTermsData& search_terms_data,
-      GURL* result);
+      GURL* result) const;
 
   // Encodes the search terms from |search_terms_args| so that we know the
   // |input_encoding|. Returns the |encoded_terms| and the
   // |encoded_original_query|. |encoded_terms| may be escaped as path or query
   // depending on |is_in_query|; |encoded_original_query| is always escaped as
   // query.
   void EncodeSearchTerms(
       const TemplateURLRef::SearchTermsArgs& search_terms_args,
       bool is_in_query,
       std::string* input_encoding,
@@ skipping 59 matching lines @@
 
   // Caches the computed engine type across successive calls to GetEngineType().
   mutable SearchEngineType engine_type_;
 
   // TODO(sky): Add date last parsed OSD file.
 
   DISALLOW_COPY_AND_ASSIGN(TemplateURL);
 };
 
 #endif  // COMPONENTS_SEARCH_ENGINES_TEMPLATE_URL_H_