Stop checking for detailed message in two tests. (#5032)

Author: wu-hui

packages/firestore/test/integration/api/batch_writes.test.ts

@@ -231,9 +231,6 @@ apiDescribe('Database batch writes', (persistence: boolean) => {
             },
             err => {
               expect(err.message).to.exist;
-              // TODO: Change this to just match "no document to update" once
-              // the backend response is consistent.
-              expect(err.message).to.match(/no (document|entity) to update/i);
               expect(err.code).to.equal('not-found');
               unsubscribe();
             }

packages/firestore/test/integration/api/database.test.ts

@@ -470,9 +470,6 @@ apiDescribe('Database', (persistence: boolean) => {
           () => Promise.reject('update should have failed.'),
           err => {
             expect(err.message).to.exist;
-            // TODO: Change this to just match "no document to update" once the
-            // backend response is consistent.
-            expect(err.message).to.match(/no (document|entity) to update/i);
             expect(err.code).to.equal('not-found');
           }
         )