Add forEach() to CSSVariablesMap

Source/core/css/CSSVariablesMapForEachCallback.idl

Index: Source/core/css/CSSVariablesMapForEachCallback.idl
diff --git a/Source/modules/webmidi/MIDIErrorCallback.idl b/Source/core/css/CSSVariablesMapForEachCallback.idl
similarity index 83%
copy from Source/modules/webmidi/MIDIErrorCallback.idl
copy to Source/core/css/CSSVariablesMapForEachCallback.idl
index 0591bf6715e14bf85426c3cfb82fc2aedf25918d..d66eb619ffbc2fd24a7e64cb57491a19bbfd3c36 100644
--- a/Source/modules/webmidi/MIDIErrorCallback.idl
+++ b/Source/core/css/CSSVariablesMapForEachCallback.idl
@@ -11,9 +11,6 @@
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
@@ -28,6 +25,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-callback interface MIDIErrorCallback {
-    boolean handleEvent(DOMError error);
+callback interface CSSVariablesMapForEachCallback {
+    [CallWith=ThisValue] boolean handleItem(DOMString value, DOMString name, CSSVariablesMap map);
+    boolean handleItem(DOMString value, DOMString name, CSSVariablesMap map);
 };