base: Add/Fix namespace closing comments.

base/process/memory.cc

 // Copyright 2014 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/process/memory.h"
 
 namespace base {
 
 // Defined in memory_mac.mm for Mac.
 #if !defined(OS_MACOSX)
 
 bool UncheckedCalloc(size_t num_items, size_t size, void** result) {
   const size_t alloc_size = num_items * size;
 
   // Overflow check
   if (size && ((alloc_size / size) != num_items)) {
     *result = NULL;
     return false;
   }
 
   if (!UncheckedMalloc(alloc_size, result))
     return false;
 
   memset(*result, 0, alloc_size);
   return true;
 }
 
 #endif
 
-}
+}  // namespace base