[BackgroundSync Cleanup] Remove periodic sync code

third_party/WebKit/public/platform/modules/background_sync/WebSyncRegistration.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebSyncRegistration_h
 #define WebSyncRegistration_h
 
 #include "public/platform/WebPrivatePtr.h"
 #include "public/platform/WebString.h"
 
 namespace blink {
 
 struct WebSyncRegistration {
     enum NetworkState {
         NetworkStateAny = 0,
         NetworkStateAvoidCellular,
         NetworkStateOnline,
         NetworkStateLast = NetworkStateOnline
     };
 
     enum { UNREGISTERED_SYNC_ID = -1};
 
-    enum Periodicity {
-        PeriodicityPeriodic = 0,
-        PeriodicityOneShot,
-        PeriodicityLast = PeriodicityOneShot
-    };
-
     WebSyncRegistration()
         : id(UNREGISTERED_SYNC_ID)
-        , periodicity(PeriodicityOneShot)
         , tag("")
-        , minPeriodMs(0)
         , networkState(NetworkState::NetworkStateOnline)
     {
     }
 
-    WebSyncRegistration(int64_t id, Periodicity periodicity,
-        const WebString& registrationTag, unsigned long minPeriodMs,
+    WebSyncRegistration(int64_t id,
+        const WebString& registrationTag,
         NetworkState networkState)
         : id(id)
-        , periodicity(periodicity)
         , tag(registrationTag)
-        , minPeriodMs(minPeriodMs)
         , networkState(networkState)
     {
     }
 
     /* Internal identity; not exposed to JS API. */
     int64_t id;
 
-    /* Internal flag; not directly exposed to JS API.
-     * Instead, this determines whether this object is represented in JS as a
-     * SyncRegistration or a PeriodicSyncRegistration.
-     */
-    Periodicity periodicity;
-
     WebString tag;
-
-    /* Minimum time between periodic sync events, in milliseconds. A 0 value
-     * here means that the event is a one-shot (not periodic.)
-     */
-    unsigned long minPeriodMs;
-
     NetworkState networkState;
 };
 
 } // namespace blink
 
 #endif // WebSyncRegistration_h