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

chrome/browser/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.h

Index: chrome/browser/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.h
diff --git a/chrome/browser/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.h b/chrome/browser/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.h
index 3278fbb7f959afd6b5f57016808fa3934e80367e..d29d9c1b6d8a64944d440dd10c6af23cabba2509 100644
--- a/chrome/browser/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.h
+++ b/chrome/browser/page_load_metrics/observers/resource_prefetch_predictor_page_load_metrics_observer.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_RESOURCE_PREFETCH_PREDICTOR_PAGE_LOAD_METRICS_OBSERVER_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_RESOURCE_PREFETCH_PREDICTOR_PAGE_LOAD_METRICS_OBSERVER_H_
 
+#include <memory>
 #include "chrome/browser/page_load_metrics/page_load_metrics_observer.h"
 
 namespace content {
@@ -13,6 +14,7 @@ class WebContents;
 
 namespace predictors {
 class ResourcePrefetchPredictor;
+class LoadingDataCollector;
 }
 
 namespace internal {
@@ -36,6 +38,7 @@ class ResourcePrefetchPredictorPageLoadMetricsObserver
   // outlive this observer.
   explicit ResourcePrefetchPredictorPageLoadMetricsObserver(
       predictors::ResourcePrefetchPredictor* predictor,
+      predictors::LoadingDataCollector* collector,
       content::WebContents* web_contents);
 
   ~ResourcePrefetchPredictorPageLoadMetricsObserver() override;
@@ -56,6 +59,7 @@ class ResourcePrefetchPredictorPageLoadMetricsObserver
 
  private:
   predictors::ResourcePrefetchPredictor* predictor_;
+  predictors::LoadingDataCollector* collector_;
   content::WebContents* web_contents_;
   bool record_histograms_;