Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/objectivec/DevTools/check_version_stamps.sh

-#!/bin/bash
-
-# This script checks that the runtime version number constant in the compiler
-# source and in the runtime source is the same.
-#
-# A distro can be made of the protobuf sources with only a subset of the
-# languages, so if the compiler depended on the Objective C runtime, those
-# builds would break. At the same time, we don't want the runtime source
-# depending on the compiler sources; so two copies of the constant are needed.
-
-set -eu
-
-readonly ScriptDir=$(dirname "$(echo $0 | sed -e "s,^\([^/]\),$(pwd)/\1,")")
-readonly ProtoRootDir="${ScriptDir}/../.."
-
-die() {
-    echo "Error: $1"
-    exit 1
-}
-
-readonly ConstantName=GOOGLE_PROTOBUF_OBJC_GEN_VERSION
-
-# Collect version from plugin sources.
-
-readonly PluginSrc="${ProtoRootDir}/src/google/protobuf/compiler/objectivec/objectivec_file.cc"
-readonly PluginVersion=$( \
-    cat "${PluginSrc}" \
-        | sed -n -e "s:const int32 ${ConstantName} = \([0-9]*\);:\1:p"
-)
-
-if [[ -z "${PluginVersion}" ]] ; then
-    die "Failed to find ${ConstantName} in the plugin source (${PluginSrc})."
-fi
-
-# Collect version from runtime sources.
-
-readonly RuntimeSrc="${ProtoRootDir}/objectivec/GPBBootstrap.h"
-readonly RuntimeVersion=$( \
-    cat "${RuntimeSrc}" \
-        | sed -n -e "s:#define ${ConstantName} \([0-9]*\):\1:p"
-)
-
-if [[ -z "${RuntimeVersion}" ]] ; then
-    die "Failed to find ${ConstantName} in the runtime source (${RuntimeSrc})."
-fi
-
-# Compare them.
-
-if [[ "${PluginVersion}" != "${RuntimeVersion}" ]] ; then
-    die "Versions don't match!
-   Plugin: ${PluginVersion} from ${PluginSrc}
-  Runtime: ${RuntimeVersion} from ${RuntimeSrc}
-"
-fi
-
-# Success