Disables PrivacyCollectionViewControllerTest.TestModel.

Disables this test because it fails on ios-canary. Filed a bug to
track this disabled test (see BUG=).

BUG=677121

Review-Url: https://codereview.chromium.org/2602743002
Cr-Commit-Position: refs/heads/master@{#440754}

ios/chrome/browser/ui/settings/privacy_collection_view_controller_unittest.mm

@@ -84,7 +84,8 @@ class PrivacyCollectionViewControllerTest
 
 // Tests PrivacyCollectionViewController is set up with all appropriate items
 // and sections.
-TEST_F(PrivacyCollectionViewControllerTest, TestModel) {
+// TODO(http://crbug.com/677121): reenable this test.
+TEST_F(PrivacyCollectionViewControllerTest, DISABLED_TestModel) {
   CheckController();
   EXPECT_EQ(4, NumberOfSections());