Revert "Merge pull request #11788 from comoyo/bug_811177"

This reverts commit 53d993416233fd1f5de3976ac49c62f5ddc465af, reversing
changes made to 3900b53a815eb60605aa52107736c2ba391110e3.
Revert "Merge pull request #11645 from comoyo/new_ime_webidl"

This reverts commit 9a6e241416724a08dc1524569df96180c4ba0358, reversing
changes made to 4292d74f14438b49ebd01a4dbf89fd2748926f16.