[cloud_firestore_web] Remove unit test that was only testing dart-lang. (firebase#1992)

Fixes firebase#1991

Author: ditman

packages/cloud_firestore/cloud_firestore_web/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.1.0+3
+
+- Removed unit test that was only testing dart-lang behavior.
+
 ## 0.1.0+2
 
 - Update documentation about this package being the endorsed platform for web.

packages/cloud_firestore/cloud_firestore_web/pubspec.yaml

@@ -1,7 +1,7 @@
 name: cloud_firestore_web
 description: The web implementation of cloud_firestore
 homepage: https://github.com/FirebaseExtended/flutterfire/tree/master/packages/cloud_firestore/cloud_firestore_web
-version: 0.1.0+2
+version: 0.1.0+3
 
 flutter:
   plugin:

packages/cloud_firestore/cloud_firestore_web/test/field_value_factory_web_test.dart

@@ -35,15 +35,6 @@ void main() {
       expect(actualDouble.data, isInstanceOf<web.FieldValue>());
     });
 
-    test(
-        "increment throws when attempting to increment something that is not a number",
-        () {
-      expect(() {
-        dynamic malformed = "nope";
-        factory.increment(malformed);
-      }, throwsA(isA<TypeError>()));
-    });
-
     test("serverTimestamp", () {
       final FieldValueWeb actual = factory.serverTimestamp();
       expect(actual.data, isInstanceOf<web.FieldValue>());