On Linux, turn off panels when there is no window manager present.
On Linux, turn off panels when there is no window manager present.

BUG=100381
TEST=Run on NX with no window manger and verify popups come up instead of panels.

Review URL: http://codereview.chromium.org/8302003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@105567 0039d316-1c4b-4281-b951-d872f2087c98

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