message: Insert back in the LINT.IfChangeThenChange check.
diff: @@ -127,11 +127,8 @@ function install_pip_deps {
  shift
  done
  + # LINT.IfChange(ubuntu_pip_installations)
  # TODO(aselle): Change all these to be --user instead of sudo.
  - # TODO(hyey): Add back IfChange lint check (b/143530103).
  - # ===================================================================
  - # Please change dependencies in `install_ubuntu_16_pip_deps` as well.
  - # ===================================================================
  ${SUDO_CMD} ${PIP_CMD} install keras_applications==1.0.8 --no-deps
  ${SUDO_CMD} ${PIP_CMD} install keras_preprocessing==1.1.0 --no-deps
  ${SUDO_CMD} ${PIP_CMD} install gast==0.2.2
  @@ -146,7 +143,7 @@ function install_pip_deps {
  ${PIP_CMD} install --user --upgrade attrs
  ${PIP_CMD} install --user --upgrade tf-estimator-nightly
  ${PIP_CMD} install --user --upgrade "future>=0.17.1"
  - # ===================================================================
  + # LINT.ThenChange(:ubuntu_16_pip_installations)
  }
  function install_ubuntu_16_pip_deps {
  @@ -162,10 +159,7 @@ function install_ubuntu_16_pip_deps {
  shift
  done
  - # TODO(hyey): Add back IfChange lint check (b/143530103).
  - # ===================================================================
  - # Please change dependencies in `install_pip_deps` as well.
  - # ===================================================================
  + # LINT.IfChange(ubuntu_16_pip_installations)
  "${PIP_CMD}" install --user --upgrade attrs
  "${PIP_CMD}" install keras_applications==1.0.8 --no-deps --user
  "${PIP_CMD}" install keras_preprocessing==1.1.0 --no-deps --user
  @@ -181,7 +175,7 @@ function install_ubuntu_16_pip_deps {
  "${PIP_CMD}" install --user --upgrade tf-estimator-nightly
  # TODO(b/144163919): Remove the version pin once the bug is fixed.
  "${PIP_CMD}" install --user --upgrade "tb-nightly==2.1.0a20191106"
  - # ===================================================================
  + # LINT.ThenChange(:ubuntu_pip_installations)
  }
  function install_macos_pip_deps {
  