Remove linked_ptr usage in //base.

base/supports_user_data.h

Index: base/supports_user_data.h
diff --git a/base/supports_user_data.h b/base/supports_user_data.h
index 5c1c7e945f6ec17577476d3759b54027e5c79d17..ab40c1b3c47bc143e965b083a763c88cdf2a52c5 100644
--- a/base/supports_user_data.h
+++ b/base/supports_user_data.h
@@ -9,8 +9,8 @@
 
 #include "base/base_export.h"
 #include "base/macros.h"
-#include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
 
 namespace base {
@@ -47,7 +47,7 @@ class BASE_EXPORT SupportsUserData {
   virtual ~SupportsUserData();
 
  private:
-  typedef std::map<const void*, linked_ptr<Data> > DataMap;
+  using DataMap = std::map<const void*, scoped_ptr<Data>>;
 
   // Externally-defined data accessible by key.
   DataMap user_data_;