Touch text selection is going to be enabled on aura and these layout tests
needed to be updated. Long press on text will no longer show a context menu.

BUG=381152

Review URL: https://codereview.chromium.org/320453002

git-svn-id: svn://svn.chromium.org/blink/trunk@175595 bbb929c8-8fbe-4397-9dbb-9b2b20218538