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

chrome/browser/predictors/loading_predictor.cc

Index: chrome/browser/predictors/loading_predictor.cc
diff --git a/chrome/browser/predictors/loading_predictor.cc b/chrome/browser/predictors/loading_predictor.cc
index d5bd264009427aead4df1a4926e85807fee38f60..9942426bf09c6e956017ecf93d2401ca22852440 100644
--- a/chrome/browser/predictors/loading_predictor.cc
+++ b/chrome/browser/predictors/loading_predictor.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/predictors/loading_predictor.h"
 
 #include "base/memory/ptr_util.h"
+#include "chrome/browser/predictors/loading_data_collector.h"
 #include "chrome/browser/predictors/resource_prefetch_predictor.h"
 
 namespace predictors {
@@ -13,6 +14,8 @@ LoadingPredictor::LoadingPredictor(const LoadingPredictorConfig& config,
                                    Profile* profile) {
   resource_prefetch_predictor_ =
       base::MakeUnique<ResourcePrefetchPredictor>(config, profile);
+  loading_data_collector_ =
+      base::MakeUnique<LoadingDataCollector>(resource_prefetch_predictor());
 }
 
 LoadingPredictor::~LoadingPredictor() = default;
@@ -29,6 +32,10 @@ void LoadingPredictor::StartInitialization() {
   resource_prefetch_predictor_->StartInitialization();
 }
 
+LoadingDataCollector* LoadingPredictor::loading_data_collector() const {
+  return loading_data_collector_.get();
+}
+
 ResourcePrefetchPredictor* LoadingPredictor::resource_prefetch_predictor()
     const {
   return resource_prefetch_predictor_.get();