Check that V8 snapshot files exist before including them in the installer.

chrome/installer/linux/common/installer.include

 # Recursively replace @@include@@ template variables with the referenced file,
 # and write the resulting text to stdout.
 process_template_includes() {
   INCSTACK+="$1->"
   # Includes are relative to the file that does the include.
   INCDIR=$(dirname $1)
   # Clear IFS so 'read' doesn't trim whitespace
   local OLDIFS="$IFS"
   IFS=''
   while read -r LINE
@@ skipping 120 matching lines @@
     install -m 644 "${BUILDDIR}/theme_resources_100_percent.pak" "${STAGEDIR}/${INSTALLDIR}/"
     install -m 644 "${BUILDDIR}/ui_resources_100_percent.pak" "${STAGEDIR}/${INSTALLDIR}/"
   fi
 
   # ICU data file; only necessary when icu_use_data_file_flag is set to 1
   # in build/common.gypi.
   install -m 644 "${BUILDDIR}/icudtl.dat" "${STAGEDIR}/${INSTALLDIR}/"
 
   # V8 snapshot files; only necessary when v8_use_external_startup_data is
   # set to 1 in build/common.gypi.
-  install -m 644 "${BUILDDIR}/natives_blob.bin" "${STAGEDIR}/${INSTALLDIR}/"
-  install -m 644 "${BUILDDIR}/snapshot_blob.bin" "${STAGEDIR}/${INSTALLDIR}/"
+  if [ -f "${BUILDDIR}/natives_blob.bin" ]; then
+    install -m 644 "${BUILDDIR}/natives_blob.bin" "${STAGEDIR}/${INSTALLDIR}/"
+    install -m 644 "${BUILDDIR}/snapshot_blob.bin" "${STAGEDIR}/${INSTALLDIR}/"
+  fi
 
   # sandbox
   # Rename sandbox binary with hyphen instead of underscore because that's what
   # the code looks for, but the build targets can't use hyphens (scons bug?)
   install -m 4755 -s "${BUILDDIR}/${PROGNAME}_sandbox" \
     "${STAGEDIR}/${INSTALLDIR}/${PROGNAME}-sandbox"
 
   # l10n paks
   cp -a "${BUILDDIR}/locales" "${STAGEDIR}/${INSTALLDIR}/"
   find "${STAGEDIR}/${INSTALLDIR}/locales" -type f -exec chmod 644 '{}' \;
@@ skipping 96 matching lines @@
     "${STAGEDIR}/usr/share/gnome-control-center/default-apps/${PACKAGE}.xml"
   chmod 644 "${STAGEDIR}/usr/share/gnome-control-center/default-apps/${PACKAGE}.xml"
   process_template "${BUILDDIR}/installer/common/default-app-block.template" \
     "${STAGEDIR}${INSTALLDIR}/default-app-block"
   chmod 644 "${STAGEDIR}${INSTALLDIR}/default-app-block"
 
   # documentation
   install -m 755 "${BUILDDIR}/${PROGNAME}.1" \
     "${STAGEDIR}/usr/share/man/man1/${PACKAGE}.1"
 }