Move shared_memory into base/memory subdirectory.

base/memory/shared_memory.h

Index: base/memory/shared_memory.h
diff --git a/base/shared_memory.h b/base/memory/shared_memory.h
similarity index 98%
copy from base/shared_memory.h
copy to base/memory/shared_memory.h
index 4600194cdeb65c3382f3ab4e76cc4aabb7f63c68..0e90c6ebd340429dff37fdeeb0088db0640752a3 100644
--- a/base/shared_memory.h
+++ b/base/memory/shared_memory.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef BASE_SHARED_MEMORY_H_
-#define BASE_SHARED_MEMORY_H_
+#ifndef BASE_MEMORY_SHARED_MEMORY_H_
+#define BASE_MEMORY_SHARED_MEMORY_H_
 
 #include "build/build_config.h"
 
@@ -275,4 +275,4 @@ class SharedMemoryAutoLock {
 
 }  // namespace base
 
-#endif  // BASE_SHARED_MEMORY_H_
+#endif  // BASE_MEMORY_SHARED_MEMORY_H_