Remove "theme" in extension/app unpacker error messages, make those messages localizable, and add u…

chrome/test/data/extensions/unpacker/bad_zip/bad_zip.sh

+#!/bin/bash -e
+#
+# Purpose: Create a corrupt (invalid ZIP) version of a Chromium crx.
+if test $# -ne 2; then
+  echo "Usage: bad_zip.sh <extension dir> <pem path>"
+  exit 1
+fi
+dir=$1
+key=$2
+name=$(basename "$dir")
+crx="$name.crx"
+pub="$name.pub"
+sig="$name.sig"
+zip="$name.zip"
+trap 'rm -f "$pub" "$sig" "$zip"' EXIT
+# zip up the crx dir
+cwd=$(pwd -P)
+(cd "$dir" && zip -qr -9 -X "$cwd/$zip" .)
+# truncate the zip to 8K so it's invalid
+dd if=$zip of=$zip+ bs=1024 count=8 2>/dev/null && mv $zip+ $zip
+# signature
+openssl sha1 -sha1 -binary -sign "$key" < "$zip" > "$sig"
+# public key
+openssl rsa -pubout -outform DER < "$key" > "$pub" 2>/dev/null
+byte_swap () {
+  # Take "abcdefgh" and return it as "ghefcdab"
+  echo "${1:6:2}${1:4:2}${1:2:2}${1:0:2}"
+}
+crmagic_hex="4372 3234" # Cr24
+version_hex="0200 0000" # 2
+pub_len_hex=$(byte_swap $(printf '%08x\n' $(ls -l "$pub" | awk '{print $5}')))
+sig_len_hex=$(byte_swap $(printf '%08x\n' $(ls -l "$sig" | awk '{print $5}')))
+(
+  echo "$crmagic_hex $version_hex $pub_len_hex $sig_len_hex" | xxd -r -p
+  cat "$pub" "$sig" "$zip"
+) > "$crx"
+echo "Wrote $crx with invalid ZIP"