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.h b/base/deferred_sequenced_task_runner.h
index 5a57e867..e5d57df 100644
--- a/base/deferred_sequenced_task_runner.h
+++ b/base/deferred_sequenced_task_runner.h
@@ -24,7 +24,7 @@
 class BASE_EXPORT DeferredSequencedTaskRunner : public SequencedTaskRunner {
  public:
   explicit DeferredSequencedTaskRunner(
-      const scoped_refptr<SequencedTaskRunner>& target_runner);
+      scoped_refptr<SequencedTaskRunner> target_runner);
 
   // TaskRunner implementation
   bool PostDelayedTask(const tracked_objects::Location& from_here,