sheriff: Disable flaky tests in DemoSetupTest

TBR=tbarzic@chromium.org

Bug: 1057814, 1057777
Change-Id: Iedad8ba38e635ad969e55e971394d30f71c994b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088672Reviewed-by: Brandon Tolsch <btolsch@chromium.org>
Commit-Queue: Brandon Tolsch <btolsch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747017}

chrome/browser/chromeos/login/demo_mode/demo_setup_browsertest.cc

@@ -1081,7 +1081,8 @@ IN_PROC_BROWSER_TEST_F(DemoSetupTest, NextDisabledOnNetworkScreen) {
   EXPECT_TRUE(IsScreenShown(NetworkScreenView::kScreenId));
 }
 
-IN_PROC_BROWSER_TEST_F(DemoSetupTest, ClickNetworkOnNetworkScreen) {
+// TODO(crbug.com/1057814): Disabling flaky test.
+IN_PROC_BROWSER_TEST_F(DemoSetupTest, DISABLED_ClickNetworkOnNetworkScreen) {
   SkipToScreen(NetworkScreenView::kScreenId);
   EXPECT_FALSE(IsScreenDialogElementEnabled(NetworkScreenView::kScreenId,
                                             DemoSetupDialog::kNetwork,
@@ -1094,7 +1095,9 @@ IN_PROC_BROWSER_TEST_F(DemoSetupTest, ClickNetworkOnNetworkScreen) {
   EXPECT_TRUE(IsScreenShown(EulaView::kScreenId));
 }
 
-IN_PROC_BROWSER_TEST_F(DemoSetupTest, ClickConnectedNetworkOnNetworkScreen) {
+// TODO(crbug.com/1057777): Disabling flaky test.
+IN_PROC_BROWSER_TEST_F(DemoSetupTest,
+                       DISABLED_ClickConnectedNetworkOnNetworkScreen) {
   SimulateNetworkConnected();
   SkipToScreen(NetworkScreenView::kScreenId);
   EXPECT_TRUE(IsScreenDialogElementEnabled(NetworkScreenView::kScreenId,