base: Remove the string logging from CHECK().

components/sync/test/fake_server/bookmark_entity.cc

Index: components/sync/test/fake_server/bookmark_entity.cc
diff --git a/components/sync/test/fake_server/bookmark_entity.cc b/components/sync/test/fake_server/bookmark_entity.cc
index a301a31b222a6d7f0031a5a5302ca93b824c9111..b25ef19799264f4756902207022c3f51cc583657 100644
--- a/components/sync/test/fake_server/bookmark_entity.cc
+++ b/components/sync/test/fake_server/bookmark_entity.cc
@@ -25,8 +25,10 @@ std::unique_ptr<FakeServerEntity> BookmarkEntity::CreateNew(
     const sync_pb::SyncEntity& client_entity,
     const string& parent_id,
     const string& client_guid) {
-  CHECK_EQ(0, client_entity.version()) << "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(0, client_entity.version());
+  // The given entity must be a bookmark.
+  CHECK(IsBookmark(client_entity));
 
   const string id =
       FakeServerEntity::CreateId(syncer::BOOKMARKS, base::GenerateGUID());
@@ -45,9 +47,10 @@ std::unique_ptr<FakeServerEntity> BookmarkEntity::CreateUpdatedVersion(
     const sync_pb::SyncEntity& client_entity,
     const FakeServerEntity& current_server_entity,
     const string& parent_id) {
-  CHECK_NE(0, client_entity.version()) << "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(0, client_entity.version());
+  // The given entity must be a bookmark.
+  CHECK(IsBookmark(client_entity));
 
   const BookmarkEntity& current_bookmark_entity =
       static_cast<const BookmarkEntity&>(current_server_entity);