Revert "Try go-negotiation when invocation request is deferred."

This reverts commit c9bcdc94a8ae7ce28d2e8c4f9c24069272b12dac.
Revert "Prevent scanning during DHCP process"

This reverts commit 60a0da90508dc72e66e15b26dd8ed223271938f4.
Revert "removing ineffective code in WifiService.java"

This reverts commit 9b2d65ee9d4d3a6f1697997d9b1f31a0643e9947.
Revert "Remove unnecessary references in WindowManagerService"

This reverts commit 293cc6487cc70f7edd1432ff09e33bcc3b05faf7.