base: Use std::move() instead of Pass() for real movable types.

base/prefs/default_pref_store.cc

Index: base/prefs/default_pref_store.cc
diff --git a/base/prefs/default_pref_store.cc b/base/prefs/default_pref_store.cc
index efb4a754f4599dacaccf7d9de710817c0f565d96..b08ef7a52866d221ec89a98adef2d8864605b625 100644
--- a/base/prefs/default_pref_store.cc
+++ b/base/prefs/default_pref_store.cc
@@ -3,6 +3,9 @@
 // found in the LICENSE file.
 
 #include "base/prefs/default_pref_store.h"
+
+#include <utility>
+
 #include "base/logging.h"
 
 using base::Value;
@@ -29,7 +32,7 @@ bool DefaultPrefStore::HasObservers() const {
 void DefaultPrefStore::SetDefaultValue(const std::string& key,
                                        scoped_ptr<Value> value) {
   DCHECK(!GetValue(key, NULL));
-  prefs_.SetValue(key, value.Pass());
+  prefs_.SetValue(key, std::move(value));
 }
 
 void DefaultPrefStore::ReplaceDefaultValue(const std::string& key,
@@ -37,7 +40,7 @@ void DefaultPrefStore::ReplaceDefaultValue(const std::string& key,
   const Value* old_value = NULL;
   GetValue(key, &old_value);
   bool notify = !old_value->Equals(value.get());
-  prefs_.SetValue(key, value.Pass());
+  prefs_.SetValue(key, std::move(value));
   if (notify)
     FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(key));
 }