Unbundle dpkg-shlibdeps

Now that all official builders have been upgraded to trusty, we can
remove dpkg-dev from third-party.

BUG=655755
R=jochen@chromium.org,phajdan.jr@chromium.org
CC=dpranke@chromium.org,sbc@chromium.org,thestig@chromium.org

Review-Url: https://codereview.chromium.org/2662493002
Cr-Commit-Position: refs/heads/master@{#446746}

chrome/installer/linux/BUILD.gn

@@ -289,8 +289,6 @@ template("linux_package") {
       branding_path_component,
       "-s",
       rebase_path(sysroot),
-      "-e",
-      rebase_path("//third_party/dpkg-dev"),
     ]
     deps = [
       ":installer_deps",

chrome/installer/linux/debian/build.sh

@@ -129,7 +129,6 @@ usage() {
   echo "-b dir     build input directory    [${BUILDDIR}]"
   echo "-d brand   either chromium or google_chrome"
   echo "-s dir     /path/to/sysroot"
-  echo "-e dir     /path/to/dpkg-dev"
   echo "-h         this help message"
 }
 
@@ -164,7 +163,7 @@ verify_channel() {
 }
 
 process_opts() {
-  while getopts ":e:s:o:b:c:a:d:h" OPTNAME
+  while getopts ":s:o:b:c:a:d:h" OPTNAME
   do
     case $OPTNAME in
       o )
@@ -186,9 +185,6 @@ process_opts() {
       s )
         SYSROOT="$OPTARG"
         ;;
-      e )
-        DPKG_DEV_DIR="$OPTARG"
-        ;;
       h )
         usage
         exit 0
@@ -282,11 +278,8 @@ else
   SHLIB_ARGS="${SHLIB_ARGS} -l${SYSROOT}/lib/i386-linux-gnu"
 fi
 SHLIB_ARGS="${SHLIB_ARGS} -l${SYSROOT}/usr/lib"
-# TODO(thomasanderson): Unbundle dpkg-shlibdeps once the Precise->Trusty
-# transition is complete by reverting CL 2411423002 and applying ps40001.
-DPKG_SHLIB_DEPS=$(cd ${SYSROOT} && DPKG_DATADIR=${DPKG_DEV_DIR} \
-  perl -I ${DPKG_DEV_DIR}/scripts ${DPKG_DEV_DIR}/scripts/dpkg-shlibdeps.pl \
-  ${SHLIB_ARGS:-} -O -e"$BUILDDIR/chrome" | sed 's/^shlibs:Depends=//')
+DPKG_SHLIB_DEPS=$(cd ${SYSROOT} && dpkg-shlibdeps ${SHLIB_ARGS:-} -O \
+                  -e"$BUILDDIR/chrome" | sed 's/^shlibs:Depends=//')
 if [ -n "$SAVE_LDLP" ]; then
   LD_LIBRARY_PATH=$SAVE_LDLP
 fi