[ChromeDriver] Exclude ExistingUserDataDirTest on Android

ExistingUserDataDirTest is not supported on Android. Excluding it.

TBR=crouleau@chromium.org

Bug: chromedriver:2446
Change-Id: I0bceb8cd282f51c128d63c8a178d91ec7beea7c2
Reviewed-on: https://chromium-review.googlesource.com/1089476Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565130}

chrome/test/chromedriver/test/run_py_tests.py

@@ -204,6 +204,8 @@ _ANDROID_NEGATIVE_FILTER['chrome'] = (
         'ChromeDriverTest.testCloseWindowUsingJavascript',
         # Android doesn't support headless mode
         'HeadlessInvalidCertificateTest.*',
+        # Android doesn't support user-data-dir switch
+        'ExistingUserDataDirTest.*',
     ]
 )
 _ANDROID_NEGATIVE_FILTER['chrome_stable'] = (