Take two at fixing android bots still using testlistjson.

testlistjson should go down the same codepath as other content
that serves up the actual file content so that it gets
the right master name.

TBR since this is causing 500s on the live server.

TBR=szager@chromium.org

Revert "Get rid of testlistjson query parameter."

This reverts r180005. Turns out that the android JSONResultsGenerator
really does depend on testlistjson not having the results and times. :(

TBR=szager@chromium.org

Review URL: https://codereview.chromium.org/467453002

git-svn-id: svn://svn.chromium.org/blink/trunk@180011 bbb929c8-8fbe-4397-9dbb-9b2b20218538