Remove custom counts histogram from the blink API.

third_party/WebKit/Source/core/dom/DocumentStatisticsCollector.cpp

 // Copyright 2015 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 "DocumentStatisticsCollector.h"
 
 #include "core/HTMLNames.h"
 #include "core/InputTypeNames.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/dom/Text.h"
 #include "core/frame/FrameHost.h"
 #include "core/html/HTMLHeadElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLMetaElement.h"
+#include "platform/Histogram.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebDistillability.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 namespace {
 
 // Saturate the length of a paragraph to save time.
@@ skipping 211 matching lines @@
     double startTime = monotonicallyIncreasingTime();
 
     // This should be cheap since collectStatistics is only called right after layout.
     document.updateLayoutTreeIfNeeded();
 
     // Traverse the DOM tree and collect statistics.
     collectFeatures(*body, features);
     features.openGraph = hasOpenGraphArticle(*head);
 
     double elapsedTime = monotonicallyIncreasingTime() - startTime;
-    Platform::current()->histogramCustomCounts("WebCore.DistillabilityUs", static_cast<int>(1e6 * elapsedTime), 1, 1000000, 50);
+
+    DEFINE_STATIC_LOCAL(CustomCountHistogram, distillabilityHistogram, ("WebCore.DistillabilityUs", 1, 1000000, 50));
+    distillabilityHistogram.count(static_cast<int>(1e6 * elapsedTime));
 
     return features;
 }
 
 } // namespace blink