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 e81841889e1fae246ea27d32670ccc2ee016c575..17702bc139bfbfc3836ef24aaf79f8b36de04da4 100644
--- a/chrome/browser/predictors/loading_predictor.cc
+++ b/chrome/browser/predictors/loading_predictor.cc
@@ -6,6 +6,7 @@
 
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
+#include "chrome/browser/predictors/loading_data_collector.h"
 #include "chrome/browser/predictors/resource_prefetch_common.h"
 #include "chrome/browser/predictors/resource_prefetch_predictor.h"
 
@@ -18,7 +19,9 @@ LoadingPredictor::LoadingPredictor(const LoadingPredictorConfig& config,
     : config_(config),
       profile_(profile),
       resource_prefetch_predictor_(
-          base::MakeUnique<ResourcePrefetchPredictor>(config, profile)) {}
+          base::MakeUnique<ResourcePrefetchPredictor>(config, profile)),
+      loading_data_collector_(base::MakeUnique<LoadingDataCollector>(
+          resource_prefetch_predictor())) {}
 
 LoadingPredictor::~LoadingPredictor() = default;
 
@@ -42,6 +45,10 @@ 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();