Import google-glog's Symbolize() and use it in debug_util_posix.cc.

base/third_party/symbolize/config.h

Index: base/third_party/symbolize/config.h
diff --git a/base/third_party/symbolize/config.h b/base/third_party/symbolize/config.h
new file mode 100644
index 0000000000000000000000000000000000000000..945f5a63498cb1bd04ee22d620b7e236a68fcf27
--- /dev/null
+++ b/base/third_party/symbolize/config.h
@@ -0,0 +1,7 @@
+// Copyright (c) 2010 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.
+
+#define GOOGLE_NAMESPACE google
+#define _END_GOOGLE_NAMESPACE_ }
+#define _START_GOOGLE_NAMESPACE_ namespace google {