Remove HistogramSupport abstraction layer

Source/modules/websockets/WebSocketPerMessageDeflate.cpp

Index: Source/modules/websockets/WebSocketPerMessageDeflate.cpp
diff --git a/Source/modules/websockets/WebSocketPerMessageDeflate.cpp b/Source/modules/websockets/WebSocketPerMessageDeflate.cpp
index d7a25b18737f436fc12dc23daf7dc1ea0b1eb16d..ae298e6dd476b8f9e1822e490c50fca0860c95b5 100644
--- a/Source/modules/websockets/WebSocketPerMessageDeflate.cpp
+++ b/Source/modules/websockets/WebSocketPerMessageDeflate.cpp
@@ -32,8 +32,8 @@
 
 #include "modules/websockets/WebSocketPerMessageDeflate.h"
 
-#include "core/platform/HistogramSupport.h"
 #include "modules/websockets/WebSocketExtensionParser.h"
+#include "public/platform/Platform.h"
 #include "wtf/HashMap.h"
 #include "wtf/text/CString.h"
 #include "wtf/text/StringHash.h"
@@ -137,7 +137,7 @@ bool CompressionMessageExtensionProcessor::processResponse(const HashMap<String,
         m_failureReason = "Received an unexpected permessage-deflate extension parameter";
         return false;
     }
-    HistogramSupport::histogramEnumeration("WebCore.WebSocket.PerMessageDeflateContextTakeOverMode", mode, WebSocketDeflater::ContextTakeOverModeMax);
+    WebKit::Platform::current()->histogramEnumeration("WebCore.WebSocket.PerMessageDeflateContextTakeOverMode", mode, WebSocketDeflater::ContextTakeOverModeMax);
     m_compress.enable(windowBits, mode);
     // Since we don't request server_no_context_takeover and server_max_window_bits, they should be ignored.
     return true;