Remove Enumeration Histograms from the Blink Platform API.

third_party/WebKit/Source/web/WebPageImportanceSignals.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 "public/web/WebPageImportanceSignals.h"
 
-#include "public/platform/Platform.h"
+#include "platform/Histogram.h"
 #include "public/web/WebViewClient.h"
 
 namespace blink {
 
 void WebPageImportanceSignals::reset()
 {
     m_hadFormInteraction = false;
     m_issuedNonGetFetchFromScript = false;
     if (m_observer)
         m_observer->pageImportanceSignalsChanged();
 }
 
 void WebPageImportanceSignals::setHadFormInteraction()
 {
     m_hadFormInteraction = true;
     if (m_observer)
         m_observer->pageImportanceSignalsChanged();
 }
 
 void WebPageImportanceSignals::setIssuedNonGetFetchFromScript()
 {
     m_issuedNonGetFetchFromScript = true;
     if (m_observer)
         m_observer->pageImportanceSignalsChanged();
 }
 
 void WebPageImportanceSignals::onCommitLoad()
 {
-    Platform::current()->histogramEnumeration("PageImportanceSignals.HadFormInteraction.OnCommitLoad", m_hadFormInteraction, 2);
-    Platform::current()->histogramEnumeration("PageImportanceSignals.IssuedNonGetFetchFromScript.OnCommitLoad", m_issuedNonGetFetchFromScript, 2);
+    DEFINE_STATIC_LOCAL(EnumerationHistogram, hadFormInteractionHistogram, ("PageImportanceSignals.HadFormInteraction.OnCommitLoad", 2));
+    hadFormInteractionHistogram.count(m_hadFormInteraction);
+
+    DEFINE_STATIC_LOCAL(EnumerationHistogram, issuedNonGetHistogram, ("PageImportanceSignals.IssuedNonGetFetchFromScript.OnCommitLoad", 2));
+    issuedNonGetHistogram.count(m_issuedNonGetFetchFromScript);
 
     reset();
 }
 
 } // namespace blink