Update moved find_depot_tools.py script location

tools/autoroller/roll_chromium_revision.py

 #!/usr/bin/env python
 # Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 """Script to roll chromium_revision in the WebRTC DEPS file."""
@@ skipping 20 matching lines @@
 COMMIT_POSITION_RE = re.compile('^Cr-Commit-Position: .*#([0-9]+).*$')
 CLANG_REVISION_RE = re.compile(r'^CLANG_REVISION=(\d+)$')
 ROLL_BRANCH_NAME = 'roll_chromium_revision'
 
 SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
 CHECKOUT_ROOT_DIR = os.path.realpath(os.path.join(SCRIPT_DIR, os.pardir,
                                                   os.pardir))
 sys.path.append(CHECKOUT_ROOT_DIR)
 import setup_links
 
-sys.path.append(os.path.join(CHECKOUT_ROOT_DIR, 'tools'))
+sys.path.append(os.path.join(CHECKOUT_ROOT_DIR, 'build'))
 import find_depot_tools
 find_depot_tools.add_depot_tools_to_path()
 from gclient import GClientKeywords
 
 CLANG_UPDATE_SCRIPT_URL_PATH = 'tools/clang/scripts/update.sh'
 CLANG_UPDATE_SCRIPT_LOCAL_PATH = os.path.join('tools', 'clang', 'scripts',
                                               'update.sh')
 
 DepsEntry = collections.namedtuple('DepsEntry', 'path url revision')
 ChangedDep = collections.namedtuple('ChangedDep',
@@ skipping 395 matching lines @@
   UpdateDeps(deps_filename, current_cr_rev, new_cr_rev)
   _LocalCommit(commit_msg, opts.dry_run)
   _UploadCL(opts.dry_run, opts.rietveld_email)
   _LaunchTrybots(opts.dry_run, opts.skip_try)
   _SendToCQ(opts.dry_run, opts.skip_cq)
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())