base: Add/Fix namespace closing comments.

base/guid_posix.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/guid.h"
 
 #include "base/rand_util.h"
 #include "base/strings/stringprintf.h"
 
 namespace base {
@@ skipping 21 matching lines @@
 // use this as well.
 std::string RandomDataToGUIDString(const uint64 bytes[2]) {
   return StringPrintf("%08X-%04X-%04X-%04X-%012llX",
                       static_cast<unsigned int>(bytes[0] >> 32),
                       static_cast<unsigned int>((bytes[0] >> 16) & 0x0000ffff),
                       static_cast<unsigned int>(bytes[0] & 0x0000ffff),
                       static_cast<unsigned int>(bytes[1] >> 48),
                       bytes[1] & 0x0000ffffffffffffULL);
 }
 
-}  // namespace guid
+}  // namespace base