Reduce usage of MessageLoopProxy in base/

base/threading/sequenced_worker_pool.h

Index: base/threading/sequenced_worker_pool.h
diff --git a/base/threading/sequenced_worker_pool.h b/base/threading/sequenced_worker_pool.h
index 4b1c74993d0384ad18ae95e79d0f0fd1dcda1094..43ca1e52bf3a06f1f21e6abd1e92de00cc87266c 100644
--- a/base/threading/sequenced_worker_pool.h
+++ b/base/threading/sequenced_worker_pool.h
@@ -21,8 +21,6 @@ class Location;
 
 namespace base {
 
-class MessageLoopProxy;
-
 template <class T> class DeleteHelper;
 
 class SequencedTaskRunner;
@@ -157,7 +155,7 @@ class BASE_EXPORT SequencedWorkerPool : public TaskRunner {
   static SequenceToken GetSequenceTokenForCurrentThread();
 
   // When constructing a SequencedWorkerPool, there must be a
-  // MessageLoop on the current thread unless you plan to deliberately
+  // Task Runner on the current thread unless you plan to deliberately
   // leak it.
 
   // Pass the maximum number of threads (they will be lazily created as needed)
@@ -347,7 +345,7 @@ class BASE_EXPORT SequencedWorkerPool : public TaskRunner {
   class Inner;
   class Worker;
 
-  const scoped_refptr<MessageLoopProxy> constructor_message_loop_;
+  const scoped_refptr<SequencedTaskRunner> constructor_task_runner_;
 
   // Avoid pulling in too many headers by putting (almost) everything
   // into |inner_|.