Linux: Correct the path to gnome-default-applications.xml.

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 "$XDG_ICON_RESOURCE" ]; then
   echo "Error: Could not find xdg-icon-resource" >&2
   exit 1
 fi
 for icon in "@@INSTALLDIR@@/product_logo_"*.png; do
   size="${icon##*/product_logo_}"
   "$XDG_ICON_RESOURCE" install --size "${size%.png}" "$icon" "@@PACKAGE@@"
 done
@@ skipping 45 matching lines @@
 # matching line, then the file is unchanged.
 insert_after_first_match() {
   # $1: file to update
   # $2: regular expression
   # $3: file to insert
   sed -i -e "1,/$2/ {
     /$2/ r $3
     }" "$1"
 }
 
-# If /usr/share/gnome-control-center/gnome-default-applications.xml 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/gnome-default-applications.xml
+# If /usr/share/gnome-control-center/default-apps/gnome-default-applications.xml
+# 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"
 fi