Explicitly specify whether to emit frame pointers by default.

tools/gn/bootstrap/bootstrap.py

 #!/usr/bin/env python
 # Copyright 2014 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 file isn't officially supported by the Chromium project. It's maintained
 # on a best-effort basis by volunteers, so some things may be broken from time
 # to time. If you encounter errors, it's most often due to files in base that
 # have been added or moved since somebody last tried this script. Generally
 # such errors are easy to diagnose.
@@ skipping 153 matching lines @@
 def build_gn_with_ninja_manually(tempdir, options):
   root_gen_dir = os.path.join(tempdir, 'gen')
   mkdir_p(root_gen_dir)
 
   write_buildflag_header_manually(root_gen_dir, 'base/allocator/features.h',
       {'USE_EXPERIMENTAL_ALLOCATOR_SHIM': 'true' if is_linux else 'false'})
 
   write_buildflag_header_manually(root_gen_dir, 'base/debug/debugging_flags.h',
       {
           'ENABLE_PROFILING': 'false',
-          'ENABLE_MEMORY_TASK_PROFILER': 'false'
+          'ENABLE_MEMORY_TASK_PROFILER': 'false',
+          'CAN_UNWIND_WITH_FRAME_POINTERS': 'false'
       })
 
   write_build_date_header(root_gen_dir)
 
   if is_mac:
     # //base/build_time.cc needs base/generated_build_date.h,
     # and this file is only included for Mac builds.
     mkdir_p(os.path.join(root_gen_dir, 'base'))
     check_call([
         os.path.join(SRC_ROOT, 'build', 'write_build_date_header.py'),
@@ skipping 592 matching lines @@
     cmd.append('-v')
   cmd.append('gn')
   check_call(cmd)
 
   if not options.debug and not is_win:
     check_call(['strip', os.path.join(build_dir, 'gn')])
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))