Revert 163034 "Moved remaining legacy viewport tests to unit tests."

This caused Android Tests (dbg) to fail:
http://build.chromium.org/p/chromium.webkit/builders/Android%20Tests%20%28dbg%29/builds/15479

> Moved remaining legacy viewport tests to unit tests.
> 
> In https://codereview.chromium.org/48613005/ most of the legacy viewport
> meta tag tests were converted into unit tests. This CL moves the
> remaining "trickier" tests.
> 
> BUG=314001
> 
> Review URL: https://codereview.chromium.org/99223005

TBR=bokan@chromium.org

Review URL: https://codereview.chromium.org/101693002

git-svn-id: svn://svn.chromium.org/blink/trunk@163077 bbb929c8-8fbe-4397-9dbb-9b2b20218538