[Media Router WebUI] Fix escape bug in filter menu.

chrome/browser/resources/media_router/media_router_data.js

Index: chrome/browser/resources/media_router/media_router_data.js
diff --git a/chrome/browser/resources/media_router/media_router_data.js b/chrome/browser/resources/media_router/media_router_data.js
index 15b07e726c7acfd51d7f7a1dc1b492f5edb3cde6..b359ae1cec1237bb0b21785d9e00a124dd1ca01d 100644
--- a/chrome/browser/resources/media_router/media_router_data.js
+++ b/chrome/browser/resources/media_router/media_router_data.js
@@ -24,10 +24,10 @@ media_router.CastModeType = {
 };
 
 /**
- * The ESC key maps to keycode '27'.
- * @const {number}
+ * The ESC key maps to KeyboardEvent.key value 'Escape'.
+ * @const {string}
  */
-media_router.KEYCODE_ESC = 27;
+media_router.KEY_ESC = 'Escape';
 
 /**
  * This corresponds to the C++ MediaRouterMetrics