base: Remove the string logging from CHECK().

components/sync/engine_impl/loopback_server/persistent_bookmark_entity.cc

Index: components/sync/engine_impl/loopback_server/persistent_bookmark_entity.cc
diff --git a/components/sync/engine_impl/loopback_server/persistent_bookmark_entity.cc b/components/sync/engine_impl/loopback_server/persistent_bookmark_entity.cc
index 16728a982e583de692cb9484ca1c423c50bc4246..ad3da2f5bf18db60de742fa12ce509f14582485a 100644
--- a/components/sync/engine_impl/loopback_server/persistent_bookmark_entity.cc
+++ b/components/sync/engine_impl/loopback_server/persistent_bookmark_entity.cc
@@ -34,8 +34,10 @@ std::unique_ptr<LoopbackServerEntity> PersistentBookmarkEntity::CreateNew(
     const sync_pb::SyncEntity& client_entity,
     const string& parent_id,
     const string& client_guid) {
-  CHECK(client_entity.version() == 0) << "New entities must have version = 0.";
-  CHECK(IsBookmark(client_entity)) << "The given entity must be a bookmark.";
+  // New entities must have version = 0.
+  CHECK_EQ(client_entity.version(), 0);
+  // The given entity must be a bookmark.
+  CHECK(IsBookmark(client_entity));
 
   const string id =
       LoopbackServerEntity::CreateId(syncer::BOOKMARKS, base::GenerateGUID());
@@ -55,9 +57,10 @@ PersistentBookmarkEntity::CreateUpdatedVersion(
     const sync_pb::SyncEntity& client_entity,
     const LoopbackServerEntity& current_server_entity,
     const string& parent_id) {
-  CHECK(client_entity.version() != 0) << "Existing entities must not have a "
-                                      << "version = 0.";
-  CHECK(IsBookmark(client_entity)) << "The given entity must be a bookmark.";
+  // Existing entities must not have a version = 0.
+  CHECK_NE(client_entity.version(), 0);
+  // The given entity must be a bookmark.
+  CHECK(IsBookmark(client_entity));
 
   const PersistentBookmarkEntity& current_bookmark_entity =
       static_cast<const PersistentBookmarkEntity&>(current_server_entity);
@@ -77,7 +80,8 @@ PersistentBookmarkEntity::CreateUpdatedVersion(
 std::unique_ptr<LoopbackServerEntity>
 PersistentBookmarkEntity::CreateFromEntity(
     const sync_pb::SyncEntity& client_entity) {
-  CHECK(IsBookmark(client_entity)) << "The given entity must be a bookmark.";
+  // The given entity must be a bookmark.
+  CHECK(IsBookmark(client_entity));
 
   return std::unique_ptr<LoopbackServerEntity>(new PersistentBookmarkEntity(
       client_entity.id_string(), client_entity.version(), client_entity.name(),