Revert "Merge pull request #14384 from MikeMcQuaid/homebrew_install_f…

…rom_api_dev"

This reverts commit b8a9fe4, reversing
changes made to daf5b27.

Library/Homebrew/brew.sh

@@ -799,25 +799,6 @@ To turn developer mode off, run $(bold "brew developer off")
   export HOMEBREW_DEV_CMD_RUN="1"
 fi
 
-# Test HOMEBREW_INSTALL_FROM_API on HOMEBREW_DEV_CMD_RUN and HOMEBREW_DEVELOPER
-# folks who haven't run a HOMEBREW_DEVELOPER_COMMAND if they are in a default
-# prefix and on a supported macOS version.
-if [[ -z "${HOMEBREW_NO_INSTALL_FROM_API}" &&
-      -z "${HOMEBREW_DEVELOPER_COMMAND}" ]] &&
-   [[ -z "${HOMEBREW_MACOS_VERSION_NUMERIC}" ||
-   "${HOMEBREW_MACOS_VERSION_NUMERIC}" -ge "110000" ]] &&
-   [[ "${HOMEBREW_PREFIX}" == "/usr/local" ||
-      "${HOMEBREW_PREFIX}" == "/opt/homebrew" ||
-      "${HOMEBREW_PREFIX}" == "/home/linuxbrew/.linuxbrew" ]]
-then
-  if [[ -n "${HOMEBREW_DEV_CMD_RUN}" || -n "${HOMEBREW_DEVELOPER}" ]]
-  then
-    export HOMEBREW_INSTALL_FROM_API=1
-  fi
-else
-  unset HOMEBREW_INSTALL_FROM_API
-fi
-
 if [[ -f "${HOMEBREW_LIBRARY}/Homebrew/cmd/${HOMEBREW_COMMAND}.sh" ]]
 then
   HOMEBREW_BASH_COMMAND="${HOMEBREW_LIBRARY}/Homebrew/cmd/${HOMEBREW_COMMAND}.sh"