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

base/memory/ref_counted.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_MEMORY_REF_COUNTED_H_
 #define BASE_MEMORY_REF_COUNTED_H_
 
 #include <cassert>
 #include <iosfwd>
 
@@ skipping 313 matching lines @@
   scoped_refptr<T>& operator=(const scoped_refptr<T>& r) {
     return *this = r.ptr_;
   }
 
   template <typename U>
   scoped_refptr<T>& operator=(const scoped_refptr<U>& r) {
     return *this = r.get();
   }
 
   scoped_refptr<T>& operator=(scoped_refptr<T>&& r) {
-    scoped_refptr<T>(r.Pass()).swap(*this);
+    scoped_refptr<T>(std::move(r)).swap(*this);
     return *this;
   }
 
   template <typename U>
   scoped_refptr<T>& operator=(scoped_refptr<U>&& r) {
-    scoped_refptr<T>(r.Pass()).swap(*this);
+    scoped_refptr<T>(std::move(r)).swap(*this);
     return *this;
   }
 
   void swap(T** pp) {
     T* p = ptr_;
     ptr_ = *pp;
     *pp = p;
   }
 
   void swap(scoped_refptr<T>& r) {
@@ skipping 80 matching lines @@
 bool operator!=(const T* lhs, const scoped_refptr<U>& rhs) {
   return !operator==(lhs, rhs);
 }
 
 template <typename T>
 std::ostream& operator<<(std::ostream& out, const scoped_refptr<T>& p) {
   return out << p.get();
 }
 
 #endif  // BASE_MEMORY_REF_COUNTED_H_