Remove HistogramSupport abstraction layer

Source/core/html/parser/HTMLResourcePreloader.cpp

Index: Source/core/html/parser/HTMLResourcePreloader.cpp
diff --git a/Source/core/html/parser/HTMLResourcePreloader.cpp b/Source/core/html/parser/HTMLResourcePreloader.cpp
index 1d5317c4775afc56f4b899ef5356754a5f127f82..95f3f14b9e455349bace96284ca95c52e0bf5a68 100644
--- a/Source/core/html/parser/HTMLResourcePreloader.cpp
+++ b/Source/core/html/parser/HTMLResourcePreloader.cpp
@@ -32,8 +32,8 @@
 #include "core/html/HTMLImport.h"
 #include "core/css/MediaList.h"
 #include "core/css/MediaQueryEvaluator.h"
-#include "core/platform/HistogramSupport.h"
 #include "core/rendering/RenderObject.h"
+#include "public/platform/Platform.h"
 
 namespace WebCore {
 
@@ -93,7 +93,7 @@ void HTMLResourcePreloader::preload(PassOwnPtr<PreloadRequest> preload)
         return;
 
     FetchRequest request = preload->resourceRequest(m_document);
-    HistogramSupport::histogramCustomCounts("WebCore.PreloadDelayMs", static_cast<int>(1000 * (monotonicallyIncreasingTime() - preload->discoveryTime())), 0, 2000, 20);
+    WebKit::Platform::current()->histogramCustomCounts("WebCore.PreloadDelayMs", static_cast<int>(1000 * (monotonicallyIncreasingTime() - preload->discoveryTime())), 0, 2000, 20);
     loadingDocument->fetcher()->preload(preload->resourceType(), request, preload->charset());
 }