Add deprecation warnings for CSSValue accessors.

Source/core/css/CSSStyleDeclaration.idl

Index: Source/core/css/CSSStyleDeclaration.idl
diff --git a/Source/core/css/CSSStyleDeclaration.idl b/Source/core/css/CSSStyleDeclaration.idl
index f552573a8eba3ae8ad6c25096f4f4bb3e88af612..86cfc433e702ea40d39b321f9b55a578134f2e18 100644
--- a/Source/core/css/CSSStyleDeclaration.idl
+++ b/Source/core/css/CSSStyleDeclaration.idl
@@ -25,7 +25,6 @@
              [TreatReturnedNullStringAs=Null, TreatNullAs=NullString, RaisesException=Setter] attribute DOMString        cssText;
 
     [TreatReturnedNullStringAs=Null] DOMString          getPropertyValue([Default=Undefined] optional DOMString propertyName);
-    CSSValue           getPropertyCSSValue([Default=Undefined] optional DOMString propertyName);
     [TreatReturnedNullStringAs=Null, RaisesException] DOMString          removeProperty([Default=Undefined] optional DOMString propertyName);
     [TreatReturnedNullStringAs=Null] DOMString          getPropertyPriority([Default=Undefined] optional DOMString propertyName);
      [RaisesException] void setProperty([Default=Undefined] optional DOMString propertyName,
@@ -38,5 +37,10 @@
     [Custom] setter void (DOMString propertyName, [TreatNullAs=NullString] DOMString propertyValue);
     readonly attribute CSSRule          parentRule;
     [RuntimeEnabled=CSSVariables] readonly attribute CSSVariablesMap var;
+
+    // Deprecated as of 2003: http://lists.w3.org/Archives/Public/www-style/2003Oct/0347.html
+    // FIXME: This should be DeprecateAs=, but currently too many LayoutTests use
+    // this function and would need CONSOLE: message rebaselines!
+    [MeasureAs=CSSStyleDeclarationGetPropertyCSSValue] CSSValue           getPropertyCSSValue([Default=Undefined] optional DOMString propertyName);
 };