predictors: Don't call IsUrlPrefetchable twice.

chrome/browser/predictors/loading_predictor.cc

 // Copyright 2017 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/loading_predictor.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "chrome/browser/predictors/loading_stats_collector.h"
 #include "chrome/browser/predictors/resource_prefetch_common.h"
@@ skipping 11 matching lines @@
           base::MakeUnique<ResourcePrefetchPredictor>(config, profile)),
       stats_collector_(base::MakeUnique<LoadingStatsCollector>(
           resource_prefetch_predictor_.get(),
           config)) {
   resource_prefetch_predictor_->SetStatsCollector(stats_collector_.get());
 }
 
 LoadingPredictor::~LoadingPredictor() = default;
 
 void LoadingPredictor::PrepareForPageLoad(const GURL& url, HintOrigin origin) {
-  if (active_hints_.find(url) != active_hints_.end() ||
-      !resource_prefetch_predictor_->IsUrlPrefetchable(url))
+  if (active_hints_.find(url) != active_hints_.end())
+    return;
+  ResourcePrefetchPredictor::Prediction prediction;
+  if (!resource_prefetch_predictor_->GetPrefetchData(url, &prediction))
     return;
 
   // To report hint durations.
   active_hints_.emplace(url, base::TimeTicks::Now());
 
   if (config_.IsPrefetchingEnabledForOrigin(profile_, origin))
-    resource_prefetch_predictor_->StartPrefetching(url);
+    resource_prefetch_predictor_->StartPrefetching(url, prediction);
 }
 
 void LoadingPredictor::CancelPageLoadHint(const GURL& url) {
   CancelActiveHint(active_hints_.find(url));
 }
 
 void LoadingPredictor::StartInitialization() {
   resource_prefetch_predictor_->StartInitialization();
 }
 
@@ skipping 83 matching lines @@
       const GURL& initial_url = it->second;
       CancelActiveHint(active_hints_.find(initial_url));
       it = active_navigations_.erase(it);
     } else {
       ++it;
     }
   }
 }
 
 }  // namespace predictors