drop unused execinfo.h header

base/sys_info_chromeos.cc

 // 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.
 
 #include "base/sys_info.h"
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/threading/thread_restrictions.h"
 
-#include <execinfo.h>
-
 namespace base {
 
 static const char* kLinuxStandardBaseVersionKeys[] = {
   "CHROMEOS_RELEASE_VERSION",
   "GOOGLE_RELEASE",
   "DISTRIB_RELEASE",
   NULL
 };
 
 const char kLinuxStandardBaseReleaseFile[] = "/etc/lsb-release";
@@ skipping 84 matching lines @@
     }
   }
 }
 
 // static
 FilePath SysInfo::GetLsbReleaseFilePath() {
   return FilePath(kLinuxStandardBaseReleaseFile);
 }
 
 }  // namespace base