Revert "Bug 1042744 - Add a container around app iframes and some chrome UI. r=alive" under suspicion of breaking JB emulator builds

This reverts commit b4775d50db4d69db42c7fb703690d9524c01bec2.
Revert "Merge pull request #22117 from michalbe/Bug-1041455-nfc-new" under suspicion of breaking JB emulator builds

This reverts commit 3177bd028e74fddf48127acee6363e385228005e, reversing
changes made to 68c4b66030bcaff7e636f0b480351d5bf2aaa0e9.