Move some files in base to base/memory.

base/memory/singleton_objc.h

Index: base/memory/singleton_objc.h
diff --git a/base/singleton_objc.h b/base/memory/singleton_objc.h
similarity index 93%
rename from base/singleton_objc.h
rename to base/memory/singleton_objc.h
index e28c8a56df7625b8a8234ec6f28796e9a08396d5..97ed96c28e7d4b1b78a1b1c268e6734aa42fb8e5 100644
--- a/base/singleton_objc.h
+++ b/base/memory/singleton_objc.h
@@ -27,12 +27,12 @@
 //   ...
 //   Foo* widgetSingleton = SingletonObjC<Foo, FooSingletonTraits>::get();
 
-#ifndef BASE_SINGLETON_OBJC_H_
-#define BASE_SINGLETON_OBJC_H_
+#ifndef BASE_MEMORY_SINGLETON_OBJC_H_
+#define BASE_MEMORY_SINGLETON_OBJC_H_
 #pragma once
 
 #import <Foundation/Foundation.h>
-#include "base/singleton.h"
+#include "base/memory/singleton.h"
 
 // Singleton traits usable to manage traditional Objective-C objects, which
 // are instantiated by sending |alloc| and |init| messages, and are deallocated
@@ -58,4 +58,4 @@ template<typename Type,
 class SingletonObjC : public Singleton<Type, Traits, DifferentiatingType> {
 };
 
-#endif  // BASE_SINGLETON_OBJC_H_
+#endif  // BASE_MEMORY_SINGLETON_OBJC_H_