base: Remove the string logging from CHECK().

components/sync/test/fake_server/tombstone_entity.cc

Index: components/sync/test/fake_server/tombstone_entity.cc
diff --git a/components/sync/test/fake_server/tombstone_entity.cc b/components/sync/test/fake_server/tombstone_entity.cc
index 014fca19311a4723c5d1698294577df6ca568e5a..819696be93c362d54ffc80e8c6d3223f2bb54f55 100644
--- a/components/sync/test/fake_server/tombstone_entity.cc
+++ b/components/sync/test/fake_server/tombstone_entity.cc
@@ -16,7 +16,8 @@ std::unique_ptr<FakeServerEntity> TombstoneEntity::Create(
     const string& id,
     const string& client_defined_unique_tag) {
   const ModelType model_type = GetModelTypeFromId(id);
-  CHECK_NE(model_type, syncer::UNSPECIFIED) << "Invalid ID was given: " << id;
+  // Invalid ID was given.
+  CHECK_NE(model_type, syncer::UNSPECIFIED);
   return std::unique_ptr<FakeServerEntity>(
       new TombstoneEntity(id, client_defined_unique_tag, model_type));
 }