[Sync] Have SyncableService's take ownership of their SyncChangeProcessor.

chrome/browser/sync/api/fake_syncable_service.cc

Index: chrome/browser/sync/api/fake_syncable_service.cc
diff --git a/chrome/browser/sync/api/fake_syncable_service.cc b/chrome/browser/sync/api/fake_syncable_service.cc
index 9823dbd1b551481c8e88b1efb3d24f268d058ccf..2f7d94807a909cf7fc25da065ee59cc69fe05a7f 100644
--- a/chrome/browser/sync/api/fake_syncable_service.cc
+++ b/chrome/browser/sync/api/fake_syncable_service.cc
@@ -30,8 +30,8 @@ bool FakeSyncableService::syncing() const {
 SyncError FakeSyncableService::MergeDataAndStartSyncing(
     syncable::ModelType type,
     const SyncDataList& initial_sync_data,
-    SyncChangeProcessor* sync_processor) {
-  sync_processor_.reset(sync_processor);
+    scoped_ptr<SyncChangeProcessor> sync_processor) {
+  sync_processor_ = sync_processor.Pass();
   type_ = type;
   if (!merge_data_and_start_syncing_error_.IsSet()) {
     syncing_ = true;
@@ -41,6 +41,7 @@ SyncError FakeSyncableService::MergeDataAndStartSyncing(
 
 void FakeSyncableService::StopSyncing(syncable::ModelType type) {
   syncing_ = false;
+  sync_processor_.reset();
 }
 
 SyncDataList FakeSyncableService::GetAllSyncData(