test: fix test failure in saucelabs ivy ie10 (#37892)

One of the ivy acceptance tests currently fails in IE10. This
is because we recently added a new test that asserts that injecting
`ViewRef` results in a `NullInjectorError`.

Due to limitations in TypeScript and in polyfills for `setPrototypeOf`,
the error cannot be thrown as `ViewRef` is always considered injectable.
In reality, `ViewRef` should not be injectable, as explicitly noted
in c00f4ab2ae.

There seems no way to simulate the proper prototype chain in such
browsers that do not natively support `__proto__`, so TypeScript
and `core-js` polyfills simply break the prototype chain and
assign inherited properties directly on `ViewRef`. i.e. so that
`ViewRef.__NG_ELEMENT_ID__` exists and DI picks it up.

There is a way for TypeScript to theoretically generate proper
prototype chain in ES5 output, but they intend to only bother
about the proper prototype chain in ES6 where `setPrototypeOf`
etc. are offically standarized. See the response:

https://github.com/microsoft/TypeScript/issues/1601#issuecomment-94892833.

PR Close #37892

packages/core/test/acceptance/di_spec.ts

@@ -2304,6 +2304,18 @@ describe('di', () => {
   });
 
   it('should not be able to inject ViewRef', () => {
+    // If the current browser does not support `__proto__` natively, this test will never
+    // result in an error as the `__NG_ELEMENT_ID__` from `ChangeDetectorRef` is directly
+    // assigned to the `ViewRef` instance, due to TypeScript, and `setPrototypeOf` polyfills
+    // not being able to simulate the prototype chain. This means that Angular's DI system
+    // considers `ViewRef` as injectable due to it having a `__NG_ELEMENT_ID__` directly
+    // assigned. We skip this test in such cases. This is currently the case in IE9 and
+    // IE10 as those don't support `__proto__`. Related TypeScript issue:
+    // https://github.com/microsoft/TypeScript/issues/1601#issuecomment-94892833.
+    if (!('__proto__' in {})) {
+      return;
+    }
+
     @Component({template: ''})
     class App {
       constructor(_viewRef: ViewRef) {}