Clear mutable inline style when it is empty.

Source/core/css/InlineVariablesIterator.h

Index: Source/core/css/InlineVariablesIterator.h
diff --git a/Source/core/svg/SVGFEPointLightElement.h b/Source/core/css/InlineVariablesIterator.h
similarity index 61%
copy from Source/core/svg/SVGFEPointLightElement.h
copy to Source/core/css/InlineVariablesIterator.h
index b32b9516fb980de708812c7afd3ff6ba3ef37df0..693adc73f3b47ba2b98f40265fcc795dca941a44 100644
--- a/Source/core/svg/SVGFEPointLightElement.h
+++ b/Source/core/css/InlineVariablesIterator.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2005 Oliver Hunt <ojh16@student.canterbury.ac.nz>
+ * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -17,23 +17,27 @@
  * Boston, MA 02110-1301, USA.
  */
 
-#ifndef SVGFEPointLightElement_h
-#define SVGFEPointLightElement_h
+#ifndef InlineVariablesIterator_h
+#define InlineVariablesIterator_h
 
-#include "core/svg/SVGFELightElement.h"
+#include "core/css/VariablesIterator.h"
 
 namespace WebCore {
 
-class SVGFEPointLightElement FINAL : public SVGFELightElement {
+class Element;
+
+class InlineVariablesIterator : public AbstractVariablesIterator {

[eseidel, 2013/12/23 21:30:23]

WebKit was historically very anti-comments.  I (and others) ahve been trying to
change that in blink.  These days when I add a new class I tend to add comments
above it to explain what its' for how it's used, etc.  I might encourage you to
do similar here, since I'm at least not immediately familar with an "inline
variables iterator".  Presumably it iterates over CSS variables in an inline
style block?  (I'm sure I'll understand better after further reading.)

[chrishtr, 2013/12/23 22:06:46]

Done.

 public:
-    static PassRefPtr<SVGFEPointLightElement> create(Document&);
+    static PassRefPtr<InlineVariablesIterator> create(Element*);
 
 private:
-    explicit SVGFEPointLightElement(Document&);
+    explicit InlineVariablesIterator(Element* element) : m_element(element) { }
+
+    virtual MutableStylePropertySet* propertySet() const OVERRIDE;
 
-    virtual PassRefPtr<LightSource> lightSource() const;
+    RefPtr<Element> m_element;
 };
 
 } // namespace WebCore
 
-#endif
+#endif // InlineVariablesIterator_h