Password manager internals page: remove command line flag
After https://codereview.chromium.org/
269513003/ landed,
the internals page is stable enough to not longer be hidden
behind the flag. In particular:
* Opening multiple instance does not result in crash.
* Multiple instances are synchronised.
* When open in Incognito, the internals page shows nothing and does not receive updates from anywhere.
BUG=347927
Review URL: https://codereview.chromium.org/
283923002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@270418 0039d316-1c4b-4281-b951-d872f2087c98