Support relocatable RPM packages

chrome/installer/linux/common/postinst.include

 # Add icons to the system icons
 XDG_ICON_RESOURCE="`which xdg-icon-resource 2> /dev/null || true`"
 if [ ! -x "$XDG_ICON_RESOURCE" ]; then
   echo "Error: Could not find xdg-icon-resource" >&2
   exit 1
 fi
-for icon in "@@INSTALLDIR@@/product_logo_"*.png; do
+for icon in "${INSTALLDIR}/product_logo_"*.png; do
   size="${icon##*/product_logo_}"
   "$XDG_ICON_RESOURCE" install --size "${size%.png}" "$icon" "@@PACKAGE@@"
 done
 
 UPDATE_MENUS="`which update-menus 2> /dev/null || true`"
 if [ -x "$UPDATE_MENUS" ]; then
   update-menus
 fi
 
 # Update cache of .desktop file MIME types. Non-fatal since it's just a cache.
@@ skipping 49 matching lines @@
 # exists, it may need to be updated to add ourselves to the default applications
 # list. If we find the file and it does not seem to contain our patch already
 # (the patch is safe to leave even after uninstall), update it.
 GNOME_DFL_APPS=/usr/share/gnome-control-center/default-apps/gnome-default-applications.xml
 if [ -f "$GNOME_DFL_APPS" ]; then
 # Conditionally insert the contents of the file "default-app-block" after the
 # first "<web-browsers>" line we find in gnome-default-applications.xml
   fgrep -q "@@MENUNAME@@" "$GNOME_DFL_APPS" || insert_after_first_match \
     "$GNOME_DFL_APPS" \
     "^[         ]*<web-browsers>[       ]*$" \
-    "@@INSTALLDIR@@/default-app-block"
+    "${INSTALLDIR}/default-app-block"
 fi