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

sync/internal_api/public/base_transaction.h

Index: sync/internal_api/public/base_transaction.h
diff --git a/sync/internal_api/public/base_transaction.h b/sync/internal_api/public/base_transaction.h
index 09cecda69bab11da5f7eff963dfba5b44daa0b66..f097fb30dfa18b5934f3521a9d88499e25f49c40 100644
--- a/sync/internal_api/public/base_transaction.h
+++ b/sync/internal_api/public/base_transaction.h
@@ -27,7 +27,7 @@ class BaseTransaction {
  public:
   // Provide access to the underlying syncable objects from BaseNode.
   virtual syncable::BaseTransaction* GetWrappedTrans() const = 0;
-  syncer::Cryptographer* GetCryptographer() const;
+  Cryptographer* GetCryptographer() const;
 
   syncable::Directory* GetDirectory() const {
     return directory_;
@@ -45,7 +45,7 @@ class BaseTransaction {
   DISALLOW_COPY_AND_ASSIGN(BaseTransaction);
 };
 
-syncer::ModelTypeSet GetEncryptedTypes(const syncer::BaseTransaction* trans);
+ModelTypeSet GetEncryptedTypes(const BaseTransaction* trans);
 
 }  // namespace syncer