Fix NewPasswordFormManager test

The test has a helper method CreateFormManager, which takes
a FormData argument and should build a NewPasswordFormManager
for that FormData.

However, due to a typo, that method always builds the NPFM
for |observed_form_| instead.

This CL fixes that typo.

Bug: 831123

Change-Id: Ibb313866f8f04d444f68f4af046716ac5ad264be
Reviewed-on: https://chromium-review.googlesource.com/c/1262515Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Commit-Queue: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597051}

components/password_manager/core/browser/new_password_form_manager_unittest.cc

@@ -208,7 +208,7 @@ class NewPasswordFormManagerTest : public testing::Test {
     fetcher_.reset(new FakeFormFetcher());
     fetcher_->Fetch();
     form_manager_.reset(new NewPasswordFormManager(
-        &client_, driver_.AsWeakPtr(), observed_form_, fetcher_.get(),
+        &client_, driver_.AsWeakPtr(), observed_form, fetcher_.get(),
         std::make_unique<NiceMock<MockFormSaver>>()));
   }
 };