PPAPI: Test cleanup, make postconditions work

This CL does a few things for our tests:
- Remove cookie-related junk that is no longer valid. We use domAutomationController to signal test completion/progress/failure now, not cookies.
- Make CheckPostConditions work again by using domAutomationController instead of the cookies, which were ignored.
- Change the way we decide whether to remove the plugin after the test is run.
- Update TestInstanceDeprecated to better reflect actual shutdown behavior.

[email protected], [email protected]

Review URL: https://codereview.chromium.org/15976003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@212121 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed