Disable __main__.ChromeDriverTest.testCanSwitchToPrintPreviewDialog

It's flaky.

I can't figure out how to mark it as flaky using this test harness, so disabling instead.

BUG=1166314

Change-Id: I744540f637ec527dc33acf7d96190fd9a89e5914
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626415
Commit-Queue: Mark Pearson <mpearson@chromium.org>
Auto-Submit: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Shengfa Lin <shengfa@google.com>
Cr-Commit-Position: refs/heads/master@{#843395}

chrome/test/chromedriver/test/run_py_tests.py

@@ -140,6 +140,8 @@ _INTEGRATION_NEGATIVE_FILTER = [
     'SessionHandlingTest.testGetSessions',
     # Flaky due to occasional timeout in starting Chrome
     'ZChromeStartRetryCountTest.testChromeStartRetryCount',
+    # Flaky failures on desktop bots. See http://crbug.com/1166314
+    'ChromeDriverTest.testCanSwitchToPrintPreviewDialog',
 ]