Merge from Chromium at DEPS revision 240154

This commit was generated by merge_to_master.py.

Change-Id: Idca0efe87ed6b721349fbeab55bfdc919cc4941d
diff --git a/Source/core/css/CSSRule.idl b/Source/core/css/CSSRule.idl
index 43130a7..9dadad9 100644
--- a/Source/core/css/CSSRule.idl
+++ b/Source/core/css/CSSRule.idl
@@ -20,8 +20,8 @@
 
 // Introduced in DOM Level 2:
 [
-    CustomWrap,
-    DependentLifetime
+    Custom=Wrap,
+    DependentLifetime,
 ] interface CSSRule {
 
     // RuleType
@@ -43,7 +43,7 @@
 
     readonly attribute unsigned short   type;
 
-             [TreatReturnedNullStringAs=Null, TreatNullAs=NullString] attribute DOMString        cssText;
+             attribute DOMString        cssText;
 
     readonly attribute CSSStyleSheet    parentStyleSheet;
     readonly attribute CSSRule          parentRule;