Roll IDL to Dartium37 (r181268)

core/css/CSSStyleDeclaration.idl

Index: core/css/CSSStyleDeclaration.idl
diff --git a/core/css/CSSStyleDeclaration.idl b/core/css/CSSStyleDeclaration.idl
index 63bd8ff4684f8668f1f6abb6eeaa4311a99d343a..1fc7e9c6abf3ce95ab3d65efe40b3af68a2f0647 100644
--- a/core/css/CSSStyleDeclaration.idl
+++ b/core/css/CSSStyleDeclaration.idl
@@ -20,7 +20,8 @@
 
 // Introduced in DOM Level 2:
 [
-    DependentLifetime
+    DependentLifetime,
+    WillBeGarbageCollected
 ] interface CSSStyleDeclaration {
              [TreatReturnedNullStringAs=Null, TreatNullAs=NullString, RaisesException=Setter] attribute DOMString        cssText;
 
@@ -29,7 +30,7 @@
     [TreatReturnedNullStringAs=Null] DOMString          getPropertyPriority([Default=Undefined] optional DOMString propertyName);
      [RaisesException] void setProperty([Default=Undefined] optional DOMString propertyName,
                                     [TreatNullAs=NullString,Default=Undefined] optional DOMString value,
-                                    [Default=Undefined] optional DOMString priority);
+                                    [TreatNullAs=NullString] optional DOMString priority = null);
 
     readonly attribute unsigned long    length;
     getter DOMString          item([Default=Undefined] optional unsigned long index);