Convert //components/prefs from scoped_ptr to std::unique_ptr

components/prefs/writeable_pref_store.h

Index: components/prefs/writeable_pref_store.h
diff --git a/components/prefs/writeable_pref_store.h b/components/prefs/writeable_pref_store.h
index 0cb9f83d7b36042e30051fb2b7e34e8c7dbc595e..6cfbcee32d80104b5a1235662a09ee29580b6783 100644
--- a/components/prefs/writeable_pref_store.h
+++ b/components/prefs/writeable_pref_store.h
@@ -7,10 +7,10 @@
 
 #include <stdint.h>
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/prefs/pref_store.h"
 
 namespace base {
@@ -36,7 +36,7 @@ class COMPONENTS_PREFS_EXPORT WriteablePrefStore : public PrefStore {
   // Sets a |value| for |key| in the store. |value| must be non-NULL. |flags| is
   // a bitmask of PrefWriteFlags.
   virtual void SetValue(const std::string& key,
-                        scoped_ptr<base::Value> value,
+                        std::unique_ptr<base::Value> value,
                         uint32_t flags) = 0;
 
   // Removes the value for |key|.
@@ -59,7 +59,7 @@ class COMPONENTS_PREFS_EXPORT WriteablePrefStore : public PrefStore {
   // tests rely on the number of notifications generated. |flags| is a bitmask
   // of PrefWriteFlags.
   virtual void SetValueSilently(const std::string& key,
-                                scoped_ptr<base::Value> value,
+                                std::unique_ptr<base::Value> value,
                                 uint32_t flags) = 0;
 
  protected: