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

components/sync/driver/about_sync_util_unittest.cc

Index: components/sync/driver/about_sync_util_unittest.cc
diff --git a/components/sync/driver/about_sync_util_unittest.cc b/components/sync/driver/about_sync_util_unittest.cc
index 37bfd05647d7cfca33805e5aa5e2c0b91bf2d47a..e6e7ac5f5316b9e6c2b9532b323cafb5f27c48b8 100644
--- a/components/sync/driver/about_sync_util_unittest.cc
+++ b/components/sync/driver/about_sync_util_unittest.cc
@@ -33,9 +33,8 @@ class SyncServiceMock : public sync_driver::FakeSyncService {
     return base::string16(base::ASCIIToUTF16("none"));
   }
 
-  syncer::sessions::SyncSessionSnapshot GetLastSessionSnapshot()
-      const override {
-    return syncer::sessions::SyncSessionSnapshot();
+  syncer::SyncCycleSnapshot GetLastCycleSnapshot() const override {
+    return syncer::SyncCycleSnapshot();
   }
 };