Remove Enumeration Histograms from the Blink Platform API.

third_party/WebKit/Source/platform/graphics/BitmapImageMetrics.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 "platform/graphics/BitmapImageMetrics.h"
 
-#include "public/platform/Platform.h"
+#include "platform/Histogram.h"
+#include "wtf/Threading.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 void BitmapImageMetrics::countDecodedImageType(const String& type)
 {
     enum DecodedImageType { // Values synced with 'DecodedImageType' in src/tools/metrics/histograms/histograms.xml
         ImageUnknown = 0,
         ImageJPEG = 1,
         ImagePNG = 2,
         ImageGIF = 3,
         ImageWebP = 4,
         ImageICO = 5,
         ImageBMP = 6,
         DecodedImageTypeEnumEnd = ImageBMP + 1
     };
 
     DecodedImageType decodedImageType =
         type == "jpg"  ? ImageJPEG :
         type == "png"  ? ImagePNG  :
         type == "gif"  ? ImageGIF  :
         type == "webp" ? ImageWebP :
         type == "ico"  ? ImageICO  :
         type == "bmp"  ? ImageBMP  : DecodedImageType::ImageUnknown;
 
-    Platform::current()->histogramEnumeration("Blink.DecodedImageType", decodedImageType, DecodedImageTypeEnumEnd);
+    DEFINE_THREAD_SAFE_STATIC_LOCAL(EnumerationHistogram, decodedImageTypeHistogram, new EnumerationHistogram("Blink.DecodedImageType", DecodedImageTypeEnumEnd));
+    decodedImageTypeHistogram.count(decodedImageType);
 }
 
 void BitmapImageMetrics::countImageOrientation(const ImageOrientationEnum orientation)
 {
-    Platform::current()->histogramEnumeration("Blink.DecodedImage.Orientation", orientation, ImageOrientationEnumEnd);
+    DEFINE_THREAD_SAFE_STATIC_LOCAL(EnumerationHistogram, orientationHistogram, new EnumerationHistogram("Blink.DecodedImage.Orientation", ImageOrientationEnumEnd));
+    orientationHistogram.count(orientation);
 }
 
 } // namespace blink