Files app: Refactor the test disabled for FilesNg

Body tag can have other CSS classes thus the class equality check can
fail. Change to mark explicitly in the C++ browser test that the test
is disabled for FilesNg.

Bug: 1035691
Change-Id: I618a201fdecbb9785812c733196af47d160dac6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2098163Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749500}

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

@@ -958,7 +958,7 @@ WRAPPED_INSTANTIATE_TEST_SUITE_P(
     FilesAppBrowserTest,
     ::testing::Values(TestCase("breadcrumbsNavigate").DisableFilesNg(),
                       TestCase("breadcrumbsLeafNoFocus").DisableFilesNg(),
-                      TestCase("breadcrumbsTooltip"),
+                      TestCase("breadcrumbsTooltip").DisableFilesNg(),
                       TestCase("breadcrumbsDownloadsTranslation")));
 
 WRAPPED_INSTANTIATE_TEST_SUITE_P(

ui/file_manager/integration_tests/file_manager/breadcrumbs.js

@@ -121,12 +121,6 @@
     const appId = await setupAndWaitUntilReady(
         RootPath.DOWNLOADS, nestedFolderTestEntries, []);
 
-    // files-ng bail out: it does not have breadcrumb tooltips.
-    const body = await remoteCall.waitForElement(appId, 'body');
-    if (body.attributes['class'] === 'files-ng') {
-      return;
-    }
-
     // Navigate to deepest folder.
     const breadcrumb = '/My files/Downloads/' +
         nestedFolderTestEntries.map(e => e.nameText).join('/');