Remove IOObservers from MessageLoopForIO.

base/message_loop/message_pump_libevent.cc

Index: base/message_loop/message_pump_libevent.cc
diff --git a/base/message_loop/message_pump_libevent.cc b/base/message_loop/message_pump_libevent.cc
index d59a234be37c6d1e5da211cb8d59f1532279be9e..fef01da9a657820672e56fd2daa6c3d6b17806c9 100644
--- a/base/message_loop/message_pump_libevent.cc
+++ b/base/message_loop/message_pump_libevent.cc
@@ -13,7 +13,6 @@
 #include "base/compiler_specific.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
-#include "base/observer_list.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/third_party/libevent/event.h"
 #include "base/time/time.h"
@@ -93,17 +92,13 @@ void MessagePumpLibevent::FileDescriptorWatcher::OnFileCanReadWithoutBlocking(
   // watching the file descriptor.
   if (!watcher_)
     return;
-  pump->WillProcessIOEvent();
   watcher_->OnFileCanReadWithoutBlocking(fd);
-  pump->DidProcessIOEvent();
 }
 
 void MessagePumpLibevent::FileDescriptorWatcher::OnFileCanWriteWithoutBlocking(
     int fd, MessagePumpLibevent* pump) {
   DCHECK(watcher_);
-  pump->WillProcessIOEvent();
   watcher_->OnFileCanWriteWithoutBlocking(fd);
-  pump->DidProcessIOEvent();
 }
 
 MessagePumpLibevent::MessagePumpLibevent()
@@ -199,14 +194,6 @@ bool MessagePumpLibevent::WatchFileDescriptor(int fd,
   return true;
 }
 
-void MessagePumpLibevent::AddIOObserver(IOObserver *obs) {
-  io_observers_.AddObserver(obs);
-}
-
-void MessagePumpLibevent::RemoveIOObserver(IOObserver *obs) {
-  io_observers_.RemoveObserver(obs);
-}
-
 // Tell libevent to break out of inner loop.
 static void timer_callback(int fd, short events, void *context)
 {
@@ -301,14 +288,6 @@ void MessagePumpLibevent::ScheduleDelayedWork(
   delayed_work_time_ = delayed_work_time;
 }
 
-void MessagePumpLibevent::WillProcessIOEvent() {
-  FOR_EACH_OBSERVER(IOObserver, io_observers_, WillProcessIOEvent());
-}
-
-void MessagePumpLibevent::DidProcessIOEvent() {
-  FOR_EACH_OBSERVER(IOObserver, io_observers_, DidProcessIOEvent());
-}
-
 bool MessagePumpLibevent::Init() {
   int fds[2];
   if (pipe(fds)) {