Make classes and structures in core/xml, core/input, core/imagebitmap and core/Init fast-allocated.

Source/core/xml/parser/XMLDocumentParser.h

Index: Source/core/xml/parser/XMLDocumentParser.h
diff --git a/Source/core/xml/parser/XMLDocumentParser.h b/Source/core/xml/parser/XMLDocumentParser.h
index 4a1300d5ed23e2d3d188235218571ee10c86eed1..16575cbbe4209f2e06adbd4c1bd50c323a5b96b6 100644
--- a/Source/core/xml/parser/XMLDocumentParser.h
+++ b/Source/core/xml/parser/XMLDocumentParser.h
@@ -97,6 +97,7 @@ public:
     static bool supportsXMLVersion(const String&);
 
     class PendingCallback {
+        WTF_MAKE_FAST_ALLOCATED(PendingCallback);
     public:
         virtual ~PendingCallback() { }
         virtual void call(XMLDocumentParser*) = 0;