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

chrome/browser/predictors/resource_prefetch_predictor_tab_helper.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_tab_helper.h"
 
 #include <string>
 
 #include "chrome/browser/predictors/loading_predictor.h"
 #include "chrome/browser/predictors/loading_predictor_factory.h"
@@ skipping 16 matching lines @@
 }
 
 void ResourcePrefetchPredictorTabHelper::DocumentOnLoadCompletedInMainFrame() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   auto* loading_predictor = LoadingPredictorFactory::GetForProfile(
       Profile::FromBrowserContext(web_contents()->GetBrowserContext()));
   if (!loading_predictor)
     return;
 
-  auto* resource_prefetch_predictor =
-      loading_predictor->resource_prefetch_predictor();
+  auto* collector = loading_predictor->loading_data_collector();
   NavigationID navigation_id(web_contents());
-  resource_prefetch_predictor->RecordMainFrameLoadComplete(navigation_id);
+  collector->RecordMainFrameLoadComplete(navigation_id);
 }
 
 void ResourcePrefetchPredictorTabHelper::DidLoadResourceFromMemoryCache(
     const GURL& url,
     const std::string& mime_type,
     content::ResourceType resource_type) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   auto* loading_predictor = LoadingPredictorFactory::GetForProfile(
       Profile::FromBrowserContext(web_contents()->GetBrowserContext()));
   if (!loading_predictor)
     return;
 
   ResourcePrefetchPredictor::URLRequestSummary summary;
   summary.navigation_id = NavigationID(web_contents());
   summary.resource_url = url;
   summary.mime_type = mime_type;
   summary.resource_type =
       ResourcePrefetchPredictor::GetResourceTypeFromMimeType(
           mime_type, resource_type);
   summary.was_cached = true;
-  auto* resource_prefetch_predictor =
-      loading_predictor->resource_prefetch_predictor();
-  resource_prefetch_predictor->RecordURLResponse(summary);
+  auto* collector = loading_predictor->loading_data_collector();
+  collector->RecordURLResponse(summary);
 }
 
 }  // namespace predictors