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

components/sync/engine/cycle/model_neutral_state.cc

Index: components/sync/engine/cycle/model_neutral_state.cc
diff --git a/components/sync/sessions/model_neutral_state.cc b/components/sync/engine/cycle/model_neutral_state.cc
similarity index 92%
rename from components/sync/sessions/model_neutral_state.cc
rename to components/sync/engine/cycle/model_neutral_state.cc
index 6b8f7d8f770e3117c578be58c236f2ca86362591..0c788aa44f4307d3012b911b4b373b4a8a15155c 100644
--- a/components/sync/sessions/model_neutral_state.cc
+++ b/components/sync/engine/cycle/model_neutral_state.cc
@@ -2,10 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/sync/sessions/model_neutral_state.h"
+#include "components/sync/engine/cycle/model_neutral_state.h"
 
 namespace syncer {
-namespace sessions {
 
 ModelNeutralState::ModelNeutralState()
     : num_successful_commits(0),
@@ -36,5 +35,4 @@ bool HasSyncerError(const ModelNeutralState& state) {
   return get_key_error || download_updates_error || commit_error;
 }
 
-}  // namespace sessions
 }  // namespace syncer