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This was less useful than I thought it would be because we
are purposely creating chromeHidden for web pages now, due
to the chrome.app API.

Also, move GetChromeHidden() to ChromeV8Context just because
it makes more sense to me there.

BUG=106014

Review URL: http://codereview.chromium.org/8761020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112540 0039d316-1c4b-4281-b951-d872f2087c98