[GCM] Updating the list of restricted keys for GCM API messages

chrome/renderer/resources/extensions/gcm_custom_bindings.js

Index: chrome/renderer/resources/extensions/gcm_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/gcm_custom_bindings.js b/chrome/renderer/resources/extensions/gcm_custom_bindings.js
index 8fcd698a87c9ce89a27f50650f04362d09ece293..fa3e5e4bcba5d41ef80c54a01e1dfccdf795bb86 100644
--- a/chrome/renderer/resources/extensions/gcm_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/gcm_custom_bindings.js
@@ -19,9 +19,11 @@ binding.registerCustomHook(function(bindingsAPI) {
         if (property.length == 0)
           throw new Error("One of data keys is empty.");
 
+        var lowerCasedProperty = property.toLowerCase();
         // Issue an error for forbidden prefixes of property names.
-        if (property.indexOf("goog.") == 0 ||
-            property.indexOf("google") == 0) {
+        if (lowerCasedProperty.indexOf("goog.") == 0 ||
+            lowerCasedProperty.indexOf("google") == 0 ||
+            property.indexOf("collapse_key") == 0) {
           throw new Error("Invalid data key: " + property);
         }