Change BackgroundSyncContextImpl to use StrongBindingSet.

content/browser/background_sync/background_sync_service_impl.h

Index: content/browser/background_sync/background_sync_service_impl.h
diff --git a/content/browser/background_sync/background_sync_service_impl.h b/content/browser/background_sync/background_sync_service_impl.h
index 2557e9b5cec007468004d802312103214e1e1d07..19916ba2fdff0894a792be3aa8c855f1527aa886 100644
--- a/content/browser/background_sync/background_sync_service_impl.h
+++ b/content/browser/background_sync/background_sync_service_impl.h
@@ -6,22 +6,17 @@
 #define CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_SERVICE_IMPL_H_
 
 #include "base/id_map.h"
-#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "content/browser/background_sync/background_sync_manager.h"
 #include "content/common/background_sync_service.mojom.h"
-#include "mojo/public/cpp/bindings/binding.h"
 
 namespace content {
 
-class BackgroundSyncContextImpl;
-
 class CONTENT_EXPORT BackgroundSyncServiceImpl
     : public NON_EXPORTED_BASE(BackgroundSyncService) {
  public:
-  BackgroundSyncServiceImpl(
-      BackgroundSyncContextImpl* background_sync_context,
-      mojo::InterfaceRequest<BackgroundSyncService> request);
+  explicit BackgroundSyncServiceImpl(
+      BackgroundSyncManager* background_sync_manager);
 
   ~BackgroundSyncServiceImpl() override;
 
@@ -68,13 +63,7 @@ class CONTENT_EXPORT BackgroundSyncServiceImpl
                                   BackgroundSyncStatus status,
                                   BackgroundSyncState sync_state);
 
-  // Called when an error is detected on binding_.
-  void OnConnectionError();
-
-  // background_sync_context_ owns this.
-  BackgroundSyncContextImpl* background_sync_context_;
-
-  mojo::Binding<BackgroundSyncService> binding_;
+  BackgroundSyncManager* const background_sync_manager_;
 
   // The registrations that the client might reference.
   IDMap<BackgroundSyncRegistrationHandle,