DevTools: remove deleted registrations from the SW list if a newer version is available.

third_party/WebKit/Source/devtools/front_end/sdk/ServiceWorkerManager.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/ServiceWorkerManager.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/ServiceWorkerManager.js b/third_party/WebKit/Source/devtools/front_end/sdk/ServiceWorkerManager.js
index 712f1ea512f7f17713a0d8cc0a5208e6d060818a..6fe0efe49445a809b28625091d7c82630726dd80 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/ServiceWorkerManager.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/ServiceWorkerManager.js
@@ -509,6 +509,14 @@ SDK.ServiceWorkerRegistration = class {
     return this._isRedundant() && (!this.errors.length || this._deleting);
   }
 
+  /**
+   * @return {boolean}
+   */
+  canBeRemoved() {
+    return this.isDeleted || this._deleting;
+  }
+
+
   clearErrors() {
     this._fingerprint = Symbol('fingerprint');
     this.errors = [];