base: Remove some unnecessary const scoped_refptr<>&.

This patch removes some unnecessary const scoped_refptr<>&. It replaces
some instances with a copy of scoped_refptr, followed by a move. Other
instances, it passes a raw non-owning pointer.

R=danakj
BUG=589044

Review URL: https://codereview.chromium.org/1800743003

Cr-Commit-Position: refs/heads/master@{#382043}
diff --git a/base/deferred_sequenced_task_runner.cc b/base/deferred_sequenced_task_runner.cc
index f805b50..7d09ef83 100644
--- a/base/deferred_sequenced_task_runner.cc
+++ b/base/deferred_sequenced_task_runner.cc
@@ -20,10 +20,8 @@
 }
 
 DeferredSequencedTaskRunner::DeferredSequencedTaskRunner(
-    const scoped_refptr<SequencedTaskRunner>& target_task_runner)
-    : started_(false),
-      target_task_runner_(target_task_runner) {
-}
+    scoped_refptr<SequencedTaskRunner> target_task_runner)
+    : started_(false), target_task_runner_(std::move(target_task_runner)) {}
 
 DeferredSequencedTaskRunner::~DeferredSequencedTaskRunner() {
 }