Change the pageset used by small_profile_creator from top_25 to typical_25.

This is needed because top_25 uses multiple WPR archives while typical_25 just has one, this makes writing a tab restore benchmark much simpler.

This patch will likely affect the generated profile startup benchmarks since it changes the test data they use.

BUG=None
TBR=tonyg@chromium.org

Review URL: https://codereview.chromium.org/25875003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226770 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226770