Remove web page replay based pyauto tests.

This is in preparation for moving webpagereplay.py into Telemetry.

BUG=

Review URL: https://codereview.chromium.org/160443004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250953 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 250953