Fix: Certain redirections remove sites from the history

Currently, PageTransition::CHAIN_END flag is removed from a History database
entry for a redirect source, even when the redirect is user initiated.

This change prevents the flag removal for user-initiated redirects.

TEST=Open http://www.google.com/ig and click on tabs multiple times. Without
this change, only the last tab clicked appears in the History page (CTRL+H).
With this change, all the tabs should appear.

TESTED=gcl try, manually

BUG=11355

Review URL: http://codereview.chromium.org/147145

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@19708 0039d316-1c4b-4281-b951-d872f2087c98
17 files changed