[ChromeDriver] Disable failing tests on Android platforms

Disabling all tests in ProxySettingTest class as they can't be run on
Android platforms.
These tests require multiple sessions which is not supported on Android.

Change-Id: I6bf6cfbe8ba9f74b67d7beb84f68d79ee0a53966
Reviewed-on: https://chromium-review.googlesource.com/1220698Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Artur Khachatryan <khachatryan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590507}

chrome/test/chromedriver/test/test_expectations

@@ -79,6 +79,7 @@ _OS_NEGATIVE_FILTER['android:chrome'] = [
     # Tests require multiple sessions, not supported on Android'
     'CorrectEventFiringTest.testShouldFireFocusEventInNonTopmostWindow',
     'PerformanceLoggingTest.testLogsSingleHttpCommand',
+    'ProxySettingTest.*',
 
     # https://bugs.chromium.org/p/chromedriver/issues/detail?id=2376
     'ImplicitWaitTest.testShouldImplicitlyWaitForASingleElement',