Remove HistogramSupport abstraction layer

Source/core/page/PagePopupController.cpp

Index: Source/core/page/PagePopupController.cpp
diff --git a/Source/core/page/PagePopupController.cpp b/Source/core/page/PagePopupController.cpp
index 8950000cbc00859b2637f8bd59392460e9736796..ba31b0260f2f37fc643df4f0704e577b0733dc47 100644
--- a/Source/core/page/PagePopupController.cpp
+++ b/Source/core/page/PagePopupController.cpp
@@ -32,8 +32,8 @@
 #include "core/page/PagePopupController.h"
 
 #include "core/page/PagePopupClient.h"
-#include "core/platform/HistogramSupport.h"
 #include "platform/text/PlatformLocale.h"
+#include "public/platform/Platform.h"
 
 namespace WebCore {
 
@@ -101,7 +101,7 @@ void PagePopupController::clearPagePopupClient()
 
 void PagePopupController::histogramEnumeration(const String& name, int sample, int boundaryValue)
 {
-    HistogramSupport::histogramEnumeration(name.utf8().data(), sample, boundaryValue);
+    WebKit::Platform::current()->histogramEnumeration(name.utf8().data(), sample, boundaryValue);
 }
 
 }