Create LoadingDataCollector class and have observers rely on it instead of ResourcePrefetchPredictor

chrome/browser/predictors/resource_prefetch_predictor_browsertest.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 <stddef.h>
 
 #include <algorithm>
 #include <set>
 
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_util.h"
 #include "base/test/histogram_tester.h"
 #include "chrome/browser/browsing_data/browsing_data_helper.h"
 
+#include "chrome/browser/predictors/loading_data_collector.h"
 #include "chrome/browser/predictors/loading_predictor.h"
 #include "chrome/browser/predictors/loading_predictor_factory.h"
 #include "chrome/browser/predictors/resource_prefetch_predictor_test_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/browsing_data_remover.h"
@@ skipping 335 matching lines @@
       server->RegisterRequestMonitor(base::Bind(
           &ResourcePrefetchPredictorBrowserTest::MonitorResourceRequest,
           base::Unretained(this)));
       ASSERT_TRUE(server->Start());
     }
 
     predictor_ = LoadingPredictorFactory::GetForProfile(browser()->profile());
     ASSERT_TRUE(predictor_);
     resource_prefetch_predictor_ = predictor_->resource_prefetch_predictor();
     // URLs from the test server contain a port number.
-    ResourcePrefetchPredictor::SetAllowPortInUrlsForTesting(true);
+    LoadingDataCollector::SetAllowPortInUrlsForTesting(true);
     EnsurePredictorInitialized();
     histogram_tester_.reset(new base::HistogramTester());
   }
 
   void TearDownOnMainThread() override {
-    ResourcePrefetchPredictor::SetAllowPortInUrlsForTesting(false);
+    LoadingDataCollector::SetAllowPortInUrlsForTesting(false);
   }
 
   void TestLearningAndPrefetching(
       const GURL& main_frame_url,
       bool match_before_first_contentful_paint = false) {
     // Navigate to |main_frame_url| and check all the expectations.
     NavigateToURLAndCheckSubresources(main_frame_url,
                                       WindowOpenDisposition::CURRENT_TAB,
                                       match_before_first_contentful_paint);
     ClearCache();
@@ skipping 621 matching lines @@
   AddResourcesFromSubresourceHtml();
 
   NavigateToURLAndCheckSubresources(initial_url);
   ClearCache();
   NavigateToURLAndCheckSubresources(initial_url);
   ClearCache();
   NavigateToURLAndCheckPrefetching(initial_url);
 }
 
 }  // namespace predictors