[Sync] Remove unneeded 'using syncer::' lines and 'syncer::' scopings

sync/sessions/ordered_commit_set.h

Index: sync/sessions/ordered_commit_set.h
diff --git a/sync/sessions/ordered_commit_set.h b/sync/sessions/ordered_commit_set.h
index 4226d2830043bb9a0e976e3fb46873b993195d57..cc6940a6172686e918d13fd6667904369391bc12 100644
--- a/sync/sessions/ordered_commit_set.h
+++ b/sync/sessions/ordered_commit_set.h
@@ -29,7 +29,7 @@ class OrderedCommitSet {
   typedef std::vector<size_t> Projection;
 
   // TODO(chron): Reserve space according to batch size?
-  explicit OrderedCommitSet(const syncer::ModelSafeRoutingInfo& routes);
+  explicit OrderedCommitSet(const ModelSafeRoutingInfo& routes);
   ~OrderedCommitSet();
 
   bool HaveCommitItem(const int64 metahandle) const {
@@ -37,7 +37,7 @@ class OrderedCommitSet {
   }
 
   void AddCommitItem(const int64 metahandle, const syncable::Id& commit_id,
-                     syncer::ModelType type);
+                     ModelType type);
 
   const std::vector<syncable::Id>& GetAllCommitIds() const {
     return commit_ids_;
@@ -55,7 +55,7 @@ class OrderedCommitSet {
   }
 
   // Same as above, but for ModelType of the item.
-  syncer::ModelType GetModelTypeAt(const size_t position) const {
+  ModelType GetModelTypeAt(const size_t position) const {
     return types_[position];
   }
 
@@ -64,7 +64,7 @@ class OrderedCommitSet {
   // response one ModelSafeGroup at a time. See GetCommitIdAt for how the
   // indices contained in the returned Projection can be used.
   const Projection& GetCommitIdProjection(
-      syncer::ModelSafeGroup group) const;
+      ModelSafeGroup group) const;
 
   size_t Size() const {
     return commit_ids_.size();
@@ -88,13 +88,13 @@ class OrderedCommitSet {
   void operator=(const OrderedCommitSet& other);
  private:
   // A set of CommitIdProjections associated with particular ModelSafeGroups.
-  typedef std::map<syncer::ModelSafeGroup, Projection> Projections;
+  typedef std::map<ModelSafeGroup, Projection> Projections;
 
   // Helper container for return value of GetCommitItemAt.
   struct CommitItem {
     int64 meta;
     syncable::Id id;
-    syncer::ModelType group;
+    ModelType group;
   };
 
   CommitItem GetCommitItemAt(const size_t position) const;
@@ -112,9 +112,9 @@ class OrderedCommitSet {
   // projection.  We could store it in commit_ids_, but sometimes we want
   // to just return the vector of Ids, so this is more straightforward
   // and shouldn't take up too much extra space since commit lists are small.
-  std::vector<syncer::ModelType> types_;
+  std::vector<ModelType> types_;
 
-  syncer::ModelSafeRoutingInfo routes_;
+  ModelSafeRoutingInfo routes_;
 };
 
 }  // namespace sessions