[Sync] Move //components/sync to the syncer namespace.

components/sync/engine_impl/cycle/nudge_tracker.cc

Index: components/sync/engine_impl/cycle/nudge_tracker.cc
diff --git a/components/sync/engine_impl/cycle/nudge_tracker.cc b/components/sync/engine_impl/cycle/nudge_tracker.cc
index 2d3f754f4b5fcb29aedefb5e3d4343c978aef7dd..b4d9b41b5d01fdcbd02e55b0f4024da0169ddb84 100644
--- a/components/sync/engine_impl/cycle/nudge_tracker.cc
+++ b/components/sync/engine_impl/cycle/nudge_tracker.cc
@@ -154,7 +154,7 @@ base::TimeDelta NudgeTracker::RecordLocalRefreshRequest(ModelTypeSet types) {
 }
 
 base::TimeDelta NudgeTracker::RecordRemoteInvalidation(
-    syncer::ModelType type,
+    ModelType type,
     std::unique_ptr<InvalidationInterface> invalidation) {
   // Forward the invalidations to the proper recipient.
   TypeTrackerMap::const_iterator tracker_it = type_trackers_.find(type);
@@ -163,13 +163,13 @@ base::TimeDelta NudgeTracker::RecordRemoteInvalidation(
   return remote_invalidation_nudge_delay_;
 }
 
-void NudgeTracker::RecordInitialSyncRequired(syncer::ModelType type) {
+void NudgeTracker::RecordInitialSyncRequired(ModelType type) {
   TypeTrackerMap::const_iterator tracker_it = type_trackers_.find(type);
   DCHECK(tracker_it != type_trackers_.end());
   tracker_it->second->RecordInitialSyncRequired();
 }
 
-void NudgeTracker::RecordCommitConflict(syncer::ModelType type) {
+void NudgeTracker::RecordCommitConflict(ModelType type) {
   TypeTrackerMap::const_iterator tracker_it = type_trackers_.find(type);
   DCHECK(tracker_it != type_trackers_.end());
   tracker_it->second->RecordCommitConflict();
@@ -384,7 +384,7 @@ void NudgeTracker::OnReceivedCustomNudgeDelays(
            delay_map.begin();
        iter != delay_map.end(); ++iter) {
     ModelType type = iter->first;
-    DCHECK(syncer::ProtocolTypes().Has(type));
+    DCHECK(ProtocolTypes().Has(type));
     TypeTrackerMap::const_iterator type_iter = type_trackers_.find(type);
     if (type_iter == type_trackers_.end())
       continue;