Remove apt_config_val from apt.include

chrome/installer/linux/common/apt.include

Index: chrome/installer/linux/common/apt.include
diff --git a/chrome/installer/linux/common/apt.include b/chrome/installer/linux/common/apt.include
index 76c65a8a77018d73099ca87ca6b484f382546642..14f196fd2556c3d9018506095a3f508143c2cad1 100644
--- a/chrome/installer/linux/common/apt.include
+++ b/chrome/installer/linux/common/apt.include
@@ -6,14 +6,6 @@ APT_CONFIG="`which apt-config 2> /dev/null`"
 SOURCES_PREAMBLE="### THIS FILE IS AUTOMATICALLY CONFIGURED ###
 # You may comment out this entry, but any other modifications may be lost.\n"
 
-# Parse apt configuration and return requested variable value.
-apt_config_val() {
-  APTVAR="$1"
-  if [ -x "$APT_CONFIG" ]; then
-    "$APT_CONFIG" dump | sed -e "/^$APTVAR /"'!d' -e "s/^$APTVAR \"\(.*\)\".*/\1/"
-  fi
-}
-
 # Install the repository/package signing keys, if they aren't already.
 # (see also: https://www.google.com/linuxrepositories/)
 install_key() {
@@ -141,14 +133,7 @@ KEYDATA
 
 # Set variables for the locations of the apt sources lists.
 find_apt_sources() {
-  # NB: These variables only *sometimes* include a trailing slash. (In
-  # particular, in Ubuntu 16.10 / Debian 9, the default value *stopped*
-  # including the trailing slash.) We have to join them with slashes, even
-  # though that sometimes gives a double slash.
-  APTDIR=$(apt_config_val Dir)
-  APTETC=$(apt_config_val 'Dir::Etc')
-  APT_SOURCES="$APTDIR/$APTETC/$(apt_config_val 'Dir::Etc::sourcelist')"
-  APT_SOURCESDIR="$APTDIR/$APTETC/$(apt_config_val 'Dir::Etc::sourceparts')"
+  eval $("$APT_CONFIG" shell APT_SOURCESDIR 'Dir::Etc::sourceparts/d')
 }
 
 # Update the Google repository if it's not set correctly.