Fixed immersive mode launch menu appearing on Windows 10. (Restructured logic to add Metro restart/Win7 immersive mode restart menu item.)
Fixed immersive mode launch menu appearing on Windows 10.
(Restructured logic to add Metro restart/Win7 immersive mode restart menu item.)

BUG=470227
R=cpu,ananta

Review URL: https://codereview.chromium.org/1073953003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#326172}

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