fix(eval): be able to throw protocol like errors

[JoelEinbinder]

sorry

[aslushnikov]

Let's get the error text dynamically - this way it'll be a cross-browser test.

    it('should be able to throw a tricky error', async({page, server}) => {
      const windowHandle = await page.evaluateHandle(() => window);
      const errorText = await windowHandle.jsonValue().catch(e => e.message);
      const error = await page.evaluate(errorText => {
        throw new Error(errorText);
      }, errorText).catch(e => e);
      expect(error.message).toBe(errorText);
    });

[aslushnikov]

Interestingly enough, this test won't work in Firefox 🤷‍♂️