Merge Webkit at r58956: Initial merge by Git.

Change-Id: I1d9fb60ea2c3f2ddc04c17a871acdb39353be228
diff --git a/WebCore/css/CSSComputedStyleDeclaration.h b/WebCore/css/CSSComputedStyleDeclaration.h
index eb93bad..ba55d77 100644
--- a/WebCore/css/CSSComputedStyleDeclaration.h
+++ b/WebCore/css/CSSComputedStyleDeclaration.h
@@ -39,7 +39,7 @@
 
     virtual String cssText() const;
 
-    virtual unsigned length() const;
+    virtual unsigned virtualLength() const;
     virtual String item(unsigned index) const;
 
     virtual PassRefPtr<CSSValue> getPropertyCSSValue(int propertyID) const;