Reland "Roll DEPS to class-dump 3.5"

testing/iossim/redirect-stdout.sh

 #!/bin/sh
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # This script executes the command given as the first argument, strips
 # cxx_destruct from stdout, and redirects the remaining stdout to the file given
 # as the second argument.
 #
 # Example: Write the text 'foo' to a file called out.txt:
 #   RedirectStdout.sh "echo foo" out.txt
 #
 # This script is invoked from iossim.gyp in order to redirect the output of
 # class-dump to a file (because gyp actions don't support redirecting output).
 # This script also removes all lines with cxx_destruct. Perhaps newer versions
 # of class-dump will fix this issue.  As of 3.5, 'cxx_destruct' still exists.
 
 if [ ${#} -ne 2 ] ; then
   echo "usage: ${0} <command> <output file>"
   exit 2
 fi
 
-$1 | sed /cxx_destruct/d > $2
+echo "// Treat class-dump output as a system header." > $2
+echo "#pragma clang system_header" >> $2
+$1 | sed /cxx_destruct/d >> $2