base: Remove the string logging from CHECK().

components/sync/test/fake_server/unique_client_entity.cc

 // Copyright 2014 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/test/fake_server/unique_client_entity.h"
 
 #include "base/guid.h"
 #include "components/sync/base/hash_util.h"
 #include "components/sync/protocol/sync.pb.h"
 #include "components/sync/test/fake_server/permanent_entity.h"
@@ skipping 33 matching lines @@
       creation_time_(creation_time),
       last_modified_time_(last_modified_time) {
   SetSpecifics(specifics);
 }
 
 UniqueClientEntity::~UniqueClientEntity() {}
 
 // static
 std::unique_ptr<FakeServerEntity> UniqueClientEntity::Create(
     const sync_pb::SyncEntity& client_entity) {
-  CHECK(client_entity.has_client_defined_unique_tag())
-      << "A UniqueClientEntity must have a client-defined unique tag.";
+  // A UniqueClientEntity must have a client-defined unique tag.
+  CHECK(client_entity.has_client_defined_unique_tag());
   ModelType model_type =
       syncer::GetModelTypeFromSpecifics(client_entity.specifics());
   string id = EffectiveIdForClientTaggedEntity(client_entity);
   return std::unique_ptr<FakeServerEntity>(new UniqueClientEntity(
       id, client_entity.client_defined_unique_tag(), model_type,
       client_entity.version(), client_entity.name(), client_entity.specifics(),
       client_entity.ctime(), client_entity.mtime()));
 }
 
 // static
@@ skipping 27 matching lines @@
 }
 
 void UniqueClientEntity::SerializeAsProto(sync_pb::SyncEntity* proto) const {
   FakeServerEntity::SerializeBaseProtoFields(proto);
 
   proto->set_ctime(creation_time_);
   proto->set_mtime(last_modified_time_);
 }
 
 }  // namespace fake_server