base: Remove most uses of MessageLoopProxy

base/memory/ref_counted_delete_on_message_loop.h

Index: base/memory/ref_counted_delete_on_message_loop.h
diff --git a/base/memory/ref_counted_delete_on_message_loop.h b/base/memory/ref_counted_delete_on_message_loop.h
index 139a1edb24f422b879bf23490e39c3afa7e68c98..6a109e81e00e6249bb4234154e915afac6223924 100644
--- a/base/memory/ref_counted_delete_on_message_loop.h
+++ b/base/memory/ref_counted_delete_on_message_loop.h
@@ -32,6 +32,7 @@ namespace base {
 //   ~Foo();
 // };
 
+// TODO(skyostil): Rename this to RefCountedDeleteOnTaskRunner.
 template <class T>
 class RefCountedDeleteOnMessageLoop : public subtle::RefCountedThreadSafeBase {
  public:
@@ -42,7 +43,7 @@ class RefCountedDeleteOnMessageLoop : public subtle::RefCountedThreadSafeBase {
   RefCountedDeleteOnMessageLoop(
       const scoped_refptr<SingleThreadTaskRunner>& task_runner)
       : task_runner_(task_runner) {
-    DCHECK(task_runner_.get());
+    DCHECK(task_runner_);
   }
 
   void AddRef() const {