Disable some context menu browser test for cros.
Disable the following for ChromeOS as they become very flaky recently.
ContextMenuBrowserTest.RealMenu
ReferrerPolicyTest.ContextMenuOrigin
ReferrerPolicyTest.ContextMenuRedirect
ReferrerPolicyTest.HttpsContextMenuOrigin
ReferrerPolicyTest.HttpsContextMenuRedirect
BUG=237819
R=avi@chromium.org, sky@chromium.org
Review URL: https://codereview.chromium.org/
14922002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@198202 0039d316-1c4b-4281-b951-d872f2087c98