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As a results, kill now unused results_are_the_same_on_every_page.

This unfortunately changes the behaviors in the following ways:

1) Streaming Csv/Block results output on per page run (e.g., one
output per page repeat), the streaming mode merges like values for the
same page (in case of page repeat, it merges results across repeat).

2) Ordering of output rows may change.

BUG=346956,392901

Review URL: https://codereview.chromium.org/394953002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285477 0039d316-1c4b-4281-b951-d872f2087c98