Defer to generate breakpad symbols to decide whether or not to dump symbols

Tools/Scripts/webkitpy/layout_tests/breakpad/dump_reader_multipart.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 104 matching lines @@
     def _path_to_minidump_stackwalk(self):
         return self._host.filesystem.join(self._build_dir, "minidump_stackwalk")
 
     def _path_to_generate_breakpad_symbols(self):
         return self._webkit_finder.path_from_chromium_base("components", "breakpad", "tools", "generate_breakpad_symbols.py")
 
     def _symbols_dir(self):
         return self._host.filesystem.join(self._build_dir, 'content_shell.syms')
 
     def _generate_breakpad_symbols_if_necessary(self):
-        if self._host.filesystem.exists(self._symbols_dir()):
-            needs_update = False
-            symbols_mtime = self._host.filesystem.mtime(self._symbols_dir())
-            for binary in self._binaries_to_symbolize():
-                full_path = self._host.filesystem.join(self._build_dir, binary)
-                if self._host.filesystem.mtime(full_path) >= symbols_mtime:
-                    needs_update = True
-            if not needs_update:
-                return
-
-        _log.debug("Regenerating breakpad symbols")
-        self._host.filesystem.rmtree(self._symbols_dir())
-
+        _log.debug("Generating breakpad symbols")
         for binary in self._binaries_to_symbolize():
             full_path = self._host.filesystem.join(self._build_dir, binary)
             cmd = [
                 self._path_to_generate_breakpad_symbols(),
                 '--binary=%s' % full_path,
                 '--symbols-dir=%s' % self._symbols_dir(),
                 '--build-dir=%s' % self._build_dir,
             ]
             try:
                 self._host.executive.run_command(cmd)
@@ skipping 18 matching lines @@
 
 
 class DumpReaderAndroid(DumpReaderMultipart):
     """Android breakpad dump reader."""
 
     def _binaries_to_symbolize(self):
         return ['lib/libcontent_shell_content_view.so']
 
     def _file_extension(self):
         return 'dmp'