Make classes and structures in core/style, core/plugins and core/streams fast-allocated.

Source/core/style/SVGComputedStyleDefs.h

Index: Source/core/style/SVGComputedStyleDefs.h
diff --git a/Source/core/style/SVGComputedStyleDefs.h b/Source/core/style/SVGComputedStyleDefs.h
index 7176a3e0d0af5ac1f8efbff7d921d56ba8b4f3a2..eb5d21fd57b7784de8ce338edd3e31db32253fb1 100644
--- a/Source/core/style/SVGComputedStyleDefs.h
+++ b/Source/core/style/SVGComputedStyleDefs.h
@@ -31,6 +31,7 @@
 #include "core/CoreExport.h"
 #include "platform/Length.h"
 #include "platform/graphics/Color.h"
+#include "wtf/Allocator.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RefCounted.h"
@@ -150,6 +151,7 @@ private:
 };
 
 class UnzoomedLength {
+    DISALLOW_ALLOCATION();
 public:
     explicit UnzoomedLength(const Length& length) : m_length(length) { }