[Sync] Move sessions/ to engine/cycle/ and rename things to match.

components/sync/driver/glue/sync_backend_host_core.h

Index: components/sync/driver/glue/sync_backend_host_core.h
diff --git a/components/sync/driver/glue/sync_backend_host_core.h b/components/sync/driver/glue/sync_backend_host_core.h
index 1fc734898c4d288b1f9cc78a6349bff9aa49d5cf..66c5a762c85b5a8a5e52e4ffa63a24163b8b5134 100644
--- a/components/sync/driver/glue/sync_backend_host_core.h
+++ b/components/sync/driver/glue/sync_backend_host_core.h
@@ -20,7 +20,7 @@
 #include "components/sync/core/sync_encryption_handler.h"
 #include "components/sync/driver/glue/sync_backend_host_impl.h"
 #include "components/sync/driver/system_encryptor.h"
-#include "components/sync/sessions/type_debug_info_observer.h"
+#include "components/sync/engine/cycle/type_debug_info_observer.h"
 #include "url/gurl.h"
 
 namespace browser_sync {
@@ -106,8 +106,7 @@ class SyncBackendHostCore
   // SyncManager::Observer implementation.  The Core just acts like an air
   // traffic controller here, forwarding incoming messages to appropriate
   // landing threads.
-  void OnSyncCycleCompleted(
-      const syncer::sessions::SyncSessionSnapshot& snapshot) override;
+  void OnSyncCycleCompleted(const syncer::SyncCycleSnapshot& snapshot) override;
   void OnInitializationComplete(
       const syncer::WeakHandle<syncer::JsBackend>& js_backend,
       const syncer::WeakHandle<syncer::DataTypeDebugInfoListener>&