base: Remove some unnecessary const scoped_refptr<>&.

base/thread_task_runner_handle.cc

Index: base/thread_task_runner_handle.cc
diff --git a/base/thread_task_runner_handle.cc b/base/thread_task_runner_handle.cc
index ee337b382e7e6a6174677558e2ff0f121bc9f61b..911e90c798c47f8b69af49a7631a5487a8a01b94 100644
--- a/base/thread_task_runner_handle.cc
+++ b/base/thread_task_runner_handle.cc
@@ -30,8 +30,8 @@ bool ThreadTaskRunnerHandle::IsSet() {
 }
 
 ThreadTaskRunnerHandle::ThreadTaskRunnerHandle(
-    const scoped_refptr<SingleThreadTaskRunner>& task_runner)
-    : task_runner_(task_runner) {
+    scoped_refptr<SingleThreadTaskRunner> task_runner)
+    : task_runner_(std::move(task_runner)) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   DCHECK(!lazy_tls_ptr.Pointer()->Get());
   lazy_tls_ptr.Pointer()->Set(this);