chromeos: Disable failing crostini tast tests.

Will revert if/when they get marked informational.

Bug: 1006681
Change-Id: I82ac85781c3f20b749eb4b1963e1673534a7cd33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895314
Auto-Submit: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711797}

chromeos/BUILD.gn

@@ -243,8 +243,14 @@ if (is_cros_chrome_sdk) {
   # To diagnose tast failures or disable tests, see go/tast-failures
   tast_test("chrome_all_tast_tests") {
     # To disable a specific test, add it the following list and cite a bug.
-    # TODO(crbug.com/1000351): Enable crostini.SanityArtifact.
-    tast_disabled_tests = [ "crostini.SanityArtifact" ]
+    tast_disabled_tests = [
+      # crbug.com/1000351
+      "crostini.SanityArtifact",
+
+      # crbug.com/1006681
+      "crostini.GPUEnabledDownload",
+      "crostini.SanityDownload",
+    ]
   }
 
   tast_test("chrome_all_tast_tests_informational") {