Disallow background tabs without matching user gesture for createWindow()
Disallow background tabs without matching user gesture for createWindow()

BUG=431335
R=mkwst@chromium.org
TEST=content_shell doesn't do tabs, so no tests

Review URL: https://codereview.chromium.org/730013002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@185430 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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