Remove unused startIgnoringLeaks and stopIgnoringLeaks functions

Source/core/dom/Node.h

Index: Source/core/dom/Node.h
diff --git a/Source/core/dom/Node.h b/Source/core/dom/Node.h
index 9366213f6b4d0500a937de51f6cfa386ed64da09..9d9ac5406533bd3cfeadf1b98400a63459eb8117 100644
--- a/Source/core/dom/Node.h
+++ b/Source/core/dom/Node.h
@@ -164,10 +164,6 @@ public:
     void operator delete(void*);
 
     static bool isSupported(const String& feature, const String& version);
-
-    static void startIgnoringLeaks();
-    static void stopIgnoringLeaks();
-
     static void dumpStatistics();
 
     enum StyleChange { NoChange, NoInherit, Inherit, Detach, Force };