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

components/sync/engine_impl/cycle/nudge_tracker_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/sync/sessions_impl/nudge_tracker.h"
+#include "components/sync/engine_impl/cycle/nudge_tracker.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 12 matching lines @@
     return testing::AssertionSuccess();
   } else {
     return testing::AssertionFailure()
            << "Left side " << ModelTypeSetToString(a)
            << ", does not match rigth side: " << ModelTypeSetToString(b);
   }
 }
 
 }  // namespace
 
-namespace sessions {
-
 class NudgeTrackerTest : public ::testing::Test {
  public:
   NudgeTrackerTest() { SetInvalidationsInSync(); }
 
   static size_t GetHintBufferSize() {
     // Assumes that no test has adjusted this size.
     return NudgeTracker::kDefaultMaxPayloadsPerType;
   }
 
   bool InvalidationsOutOfSync() const {
@@ skipping 909 matching lines @@
   RecordSuccessfulSyncCycle();
   EXPECT_TRUE(IsInvalidationAcknowledged(inv1_id));
   EXPECT_TRUE(IsInvalidationAcknowledged(inv2_id));
   EXPECT_TRUE(IsInvalidationAcknowledged(inv3_id));
   EXPECT_TRUE(IsInvalidationAcknowledged(inv4_id));
   EXPECT_TRUE(IsInvalidationAcknowledged(inv5_id));
 
   EXPECT_TRUE(AllInvalidationsAccountedFor());
 }
 
-}  // namespace sessions
 }  // namespace syncer