predictors: Add a origin for prefetch requests, remove the URL/host settings.

chrome/browser/predictors/resource_prefetch_predictor_unittest.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 "chrome/browser/predictors/resource_prefetch_predictor.h"
 
 #include <iostream>
 #include <memory>
 #include <utility>
 
@@ skipping 225 matching lines @@
   void ResetPredictor() {
     ResourcePrefetchPredictorConfig config;
     config.max_urls_to_track = 3;
     config.max_hosts_to_track = 2;
     config.min_url_visit_count = 2;
     config.max_resources_per_entry = 4;
     config.max_consecutive_misses = 2;
     config.min_resource_confidence_to_trigger_prefetch = 0.5;
 
     // TODO(shishir): Enable the prefetching mode in the tests.
-    config.mode |= ResourcePrefetchPredictorConfig::URL_LEARNING;
-    config.mode |= ResourcePrefetchPredictorConfig::HOST_LEARNING;
+    config.mode |= ResourcePrefetchPredictorConfig::LEARNING;
     predictor_.reset(new ResourcePrefetchPredictor(config, profile_.get()));
     predictor_->set_mock_tables(mock_tables_);
   }
 
   void InitializeSampleData();
 
   content::TestBrowserThreadBundle thread_bundle_;
   std::unique_ptr<TestingProfile> profile_;
   net::TestURLRequestContext url_request_context_;
 
@@ skipping 1286 matching lines @@
                          net::MEDIUM, false, false);
   predictor_->url_table_cache_->insert(
       std::make_pair(www_google_url.primary_key(), www_google_url));
 
   urls.clear();
   EXPECT_TRUE(predictor_->GetPrefetchData(main_frame_url, &urls));
   EXPECT_THAT(urls, UnorderedElementsAre(GURL(font_url)));
 }
 
 }  // namespace predictors