Add compiler-specific "examine printf format" attributes to printfs.

net/base/cookie_monster.cc

 // Copyright (c) 2006-2008 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.
 
 // Portions of this code based on Mozilla:
 //   (netwerk/cookie/src/nsCookieService.cpp)
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
@@ skipping 1154 matching lines @@
   // than the cookie path length, it's safe to index one byte past.
   if (path_.length() != url_path.length() &&
       path_[path_.length() - 1] != '/' &&
       url_path[path_.length()] != '/')
     return false;
 
   return true;
 }
 
 std::string CookieMonster::CanonicalCookie::DebugString() const {
-  return StringPrintf("name: %s value: %s path: %s creation: %llu",
+  return StringPrintf("name: %s value: %s path: %s creation: %" PRId64,
                       name_.c_str(), value_.c_str(), path_.c_str(),
-                      creation_date_.ToTimeT());
+                      static_cast<int64>(creation_date_.ToTimeT()));
 }
 
 }  // namespace