Make new TaskRunner, SequencedTaskRunner, and SingleThreadTaskRunner interfaces

base/message_loop_proxy_impl.cc

Index: base/message_loop_proxy_impl.cc
diff --git a/base/message_loop_proxy_impl.cc b/base/message_loop_proxy_impl.cc
index dd20b39dd34a36e10c4832d9528fdccfa21e28d8..eeeb1db8bfc3405d719928d6c7f41cbc9f1a567a 100644
--- a/base/message_loop_proxy_impl.cc
+++ b/base/message_loop_proxy_impl.cc
@@ -12,11 +12,6 @@ namespace base {
 MessageLoopProxyImpl::~MessageLoopProxyImpl() {
 }
 
-bool MessageLoopProxyImpl::PostTask(const tracked_objects::Location& from_here,
-                                    const base::Closure& task) {
-  return PostTaskHelper(from_here, task, 0, true);
-}
-
 bool MessageLoopProxyImpl::PostDelayedTask(
     const tracked_objects::Location& from_here,
     const base::Closure& task,
@@ -24,11 +19,6 @@ bool MessageLoopProxyImpl::PostDelayedTask(
   return PostTaskHelper(from_here, task, delay_ms, true);
 }
 
-bool MessageLoopProxyImpl::PostNonNestableTask(
-    const tracked_objects::Location& from_here, const base::Closure& task) {
-  return PostTaskHelper(from_here, task, 0, false);
-}
-
 bool MessageLoopProxyImpl::PostNonNestableDelayedTask(
     const tracked_objects::Location& from_here,
     const base::Closure& task,
@@ -36,7 +26,7 @@ bool MessageLoopProxyImpl::PostNonNestableDelayedTask(
   return PostTaskHelper(from_here, task, delay_ms, false);
 }
 
-bool MessageLoopProxyImpl::BelongsToCurrentThread() {
+bool MessageLoopProxyImpl::RunsTasksOnCurrentThread() const {
   // We shouldn't use MessageLoop::current() since it uses LazyInstance which
   // may be deleted by ~AtExitManager when a WorkerPool thread calls this
   // function.