SuggestionsSource cleanup: Remove TaskRunnerForRequestPath implementation

chrome/browser/search/suggestions/suggestions_ui.cc

 // Copyright 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/search/suggestions/suggestions_ui.h"
 
 #include <map>
 #include <string>
 
 #include "base/barrier_closure.h"
@@ skipping 105 matching lines @@
  public:
   explicit SuggestionsSource(Profile* profile);
 
   // content::URLDataSource implementation.
   std::string GetSource() const override;
   void StartDataRequest(
       const std::string& path,
       const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
       const content::URLDataSource::GotDataCallback& callback) override;
   std::string GetMimeType(const std::string& path) const override;
-  scoped_refptr<base::SingleThreadTaskRunner> TaskRunnerForRequestPath(
-      const std::string& path) const override;
 
  private:
   ~SuggestionsSource() override;
 
   // Container for the state of a request.
   struct RequestContext {
     RequestContext(
         bool is_refresh_in,
         const suggestions::SuggestionsProfile& suggestions_profile_in,
         const content::URLDataSource::GotDataCallback& callback_in);
@@ skipping 87 matching lines @@
           base::Bind(&SuggestionsSource::OnThumbnailAvailable,
                      weak_ptr_factory_.GetWeakPtr(), context, barrier));
     }
   }
 }
 
 std::string SuggestionsSource::GetMimeType(const std::string& path) const {
   return "text/html";
 }
 
-scoped_refptr<base::SingleThreadTaskRunner>
-SuggestionsSource::TaskRunnerForRequestPath(const std::string& path) const {
-  // This can be accessed from the IO thread.
-  return content::URLDataSource::TaskRunnerForRequestPath(path);
-}
-
 void SuggestionsSource::OnThumbnailsFetched(RequestContext* context) {
   std::unique_ptr<RequestContext> context_deleter(context);
 
   std::string output =
       RenderOutputHtml(context->is_refresh, context->suggestions_profile,
                        context->base64_encoded_pngs);
   context->callback.Run(base::RefCountedString::TakeString(&output));
 }
 
 void SuggestionsSource::OnThumbnailAvailable(RequestContext* context,
@@ skipping 19 matching lines @@
 
 SuggestionsUI::SuggestionsUI(content::WebUI* web_ui)
     : content::WebUIController(web_ui) {
   Profile* profile = Profile::FromWebUI(web_ui);
   content::URLDataSource::Add(profile, new SuggestionsSource(profile));
 }
 
 SuggestionsUI::~SuggestionsUI() {}
 
 }  // namespace suggestions