Move spin_lock into partition_allocator.

base/allocator/partition_allocator/spin_lock.cc

 // Copyright 2015 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/synchronization/spin_lock.h"
+#include "base/allocator/partition_allocator/spin_lock.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(OS_POSIX)
 #include <sched.h>
 #endif
 
 // The YIELD_PROCESSOR macro wraps an architecture specific-instruction that
 // informs the processor we're in a busy wait, so it can handle the branch more
 // intelligently and e.g. reduce power to our core or give more resources to the
@@ skipping 57 matching lines @@
       }
 
       // Give the OS a chance to schedule something on this core.
       YIELD_THREAD;
     } while (lock_.load(std::memory_order_relaxed));
   } while (UNLIKELY(lock_.exchange(true, std::memory_order_acquire)));
 }
 
 }  // namespace subtle
 }  // namespace base