deb stable packaging fixes

src/chrome/installer/linux/common/changelog.template

@@ -0,0 +1,5 @@
+@@PACKAGE@@ (@@VERSIONFULL@@) @@CHANNEL@@; urgency=low
+
+  * Build spec: https://chromium.googlesource.com/chromium/src.git/+/@@VERSION@@/
+
+ -- @@MAINTNAME@@ <@@MAINTMAIL@@>  @@DATE_RFC5322@@

src/chrome/installer/linux/debian/build.sh

@@ -232,9 +232,9 @@ trap cleanup 0
 process_opts "$@"
 IS_OFFICIAL_BUILD=1
 
-STAGEDIR="${OUTPUTDIR}/deb-staging-${CHANNEL}"
+STAGEDIR="${OUTPUTDIR}/deb-staging"
 mkdir -p "${STAGEDIR}"
-TMPFILEDIR="${OUTPUTDIR}/deb-tmp-${CHANNEL}"
+TMPFILEDIR="${OUTPUTDIR}/deb-tmp"
 mkdir -p "${TMPFILEDIR}"
 DEB_CHANGELOG="${TMPFILEDIR}/changelog"
 DEB_FILES="${TMPFILEDIR}/files"