Move Declarative Web Request API out of experimental and make it a feature

chrome/renderer/resources/extensions/event.js

Index: chrome/renderer/resources/extensions/event.js
diff --git a/chrome/renderer/resources/extensions/event.js b/chrome/renderer/resources/extensions/event.js
index 5db2a59e3048420b2221e830d72c4b4696dd198d..5288b6e26e22df6178452ac42f54934be2adaf80 100644
--- a/chrome/renderer/resources/extensions/event.js
+++ b/chrome/renderer/resources/extensions/event.js
@@ -257,10 +257,7 @@
   // This is defined as a function (rather than a variable) because it isn't
   // accessible until the schema bindings have been generated.
   function getDeclarativeAPI() {
-    if (chromeHidden.internalAPIs.experimental)
-      return chromeHidden.internalAPIs.experimental.declarative;
-    else
-      return undefined;
+    return chromeHidden.internalAPIs.declarative;
   }
 
   chrome.Event.prototype.addRules = function(rules, opt_cb) {