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

base/message_loop/message_loop.cc

Index: base/message_loop/message_loop.cc
diff --git a/base/message_loop/message_loop.cc b/base/message_loop/message_loop.cc
index a44f46863e405e0e4f48fb49d3c9f00a60ca4e10..a0c5f61f598dec8f78ed9645e8fef5171ab6b85c 100644
--- a/base/message_loop/message_loop.cc
+++ b/base/message_loop/message_loop.cc
@@ -5,6 +5,7 @@
 #include "base/message_loop/message_loop.h"
 
 #include <algorithm>
+#include <utility>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ -417,7 +418,7 @@ void MessageLoop::SetTaskRunner(
   DCHECK_EQ(this, current());
   DCHECK(task_runner->BelongsToCurrentThread());
   DCHECK(!unbound_task_runner_);
-  task_runner_ = task_runner.Pass();
+  task_runner_ = std::move(task_runner);
   SetThreadTaskRunnerHandle();
 }