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

base/move_unittest.cc

Index: base/move_unittest.cc
diff --git a/base/move_unittest.cc b/base/move_unittest.cc
index 1f4ce84cb6af4f1aac736704b271fea1b6fc4b19..da0be638c5ba26734ac0de3e39fc516afee57bba 100644
--- a/base/move_unittest.cc
+++ b/base/move_unittest.cc
@@ -24,7 +24,7 @@ class Container {
   Container(const Container& other) = default;
   Container& operator=(const Container& other) = default;
 
-  Container(Container&& other) { value_ = other.value_.Pass(); }
+  Container(Container&& other) { value_ = std::move(other.value_); }
 
   Container& operator=(Container&& other) {
     value_ = other.value_.Pass();