Revert "Fix chromium prebuilt"

This reverts commit ee18517a6d62ae5cd97033f62e6f36f52cded1f2.
Revert "build: update prebuilt chromium script"

This reverts commit 5d849825cb5313a2fe1775f88b15da41048f73e3.
Revert "build: Add chromium prebuilt support to envsetup.sh && The core Makefile"

This reverts commit a40bd82712e11e0f7f778972cb85514f135cd3bc.