Remove gender specific language from src/tools

tools/valgrind/locate_valgrind.sh

 #!/bin/bash
 
 # 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.
 
 # Prints a path to Valgrind binaries to be used for Chromium.
 # Select the valgrind from third_party/valgrind by default,
 # but allow users to override this default without editing scripts and
 # without specifying a commandline option
 
 export THISDIR=`dirname $0`
 
-# User may use his own valgrind by giving its path with CHROME_VALGRIND env.
+# User may use their own valgrind by giving its path with CHROME_VALGRIND env.
 if [ "$CHROME_VALGRIND" = "" ]
 then
   # Guess which binaries we should use by uname
   case "$(uname -a)" in
   *Linux*x86_64*)
     PLATFORM="linux_x64"
     ;;
   *Linux*86*)
     PLATFORM="linux_x86"
     ;;
@@ skipping 35 matching lines @@
 if ! test -x $CHROME_VALGRIND/bin/valgrind
 then
   echo "Oops, could not find Valgrind binaries in your checkout." >&2
   echo "Please see" >&2
   echo "  http://dev.chromium.org/developers/how-tos/using-valgrind/get-valgrind" >&2
   echo "for the instructions on how to download pre-built binaries." >&2
   exit 1
 fi
 
 echo $CHROME_VALGRIND