Check the format of an applicationServerKey when used to register a push subscription.

third_party/WebKit/LayoutTests/http/tests/push_messaging/subscribe-failure-no-manifest-in-service-worker.html

Index: third_party/WebKit/LayoutTests/http/tests/push_messaging/subscribe-failure-no-manifest-in-service-worker.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/push_messaging/subscribe-failure-no-manifest-in-service-worker.html b/third_party/WebKit/LayoutTests/http/tests/push_messaging/subscribe-failure-no-manifest-in-service-worker.html
index bfe9ed86cdbcc895eaeb88f10a5472318d72e6c0..efa132e0e34a57f80b53fc62ba5d841038e8bb25 100644
--- a/third_party/WebKit/LayoutTests/http/tests/push_messaging/subscribe-failure-no-manifest-in-service-worker.html
+++ b/third_party/WebKit/LayoutTests/http/tests/push_messaging/subscribe-failure-no-manifest-in-service-worker.html
@@ -20,9 +20,10 @@ async_test(function(test) {
 
     getActiveServiceWorkerWithMessagePort(test, script, scope)
         .then(function(workerInfo) {
-            // Call subscribe in service worker context. It will fail because although the sender
-            // id has been specified in the manifest, the manifest cannot be read in a service
-            // worker context, and no previous subscription will exist from a document context.
+            // Call subscribe in service worker context. It will fail because
+            // although the sender id has been specified in the manifest, the
+            // manifest cannot be read in a service worker context, and no
+            // previous subscription will exist from a document context.
             workerInfo.port.postMessage({command: 'subscribe'});
 
             workerInfo.port.addEventListener('message', function(event) {