Removes mouse listeners from UserInputMonitor.

media/base/user_input_monitor.cc

Index: media/base/user_input_monitor.cc
diff --git a/media/base/user_input_monitor.cc b/media/base/user_input_monitor.cc
index 60ab0b675cb9cbf4513e1f2ccaf3c9a33d0c250c..40ae87ed94b7b768721ba88893c26ad5929fd38e 100644
--- a/media/base/user_input_monitor.cc
+++ b/media/base/user_input_monitor.cc
@@ -16,39 +16,10 @@ std::unique_ptr<UserInputMonitor> UserInputMonitor::Create(
 }
 #endif  // DISABLE_USER_INPUT_MONITOR
 
-UserInputMonitor::UserInputMonitor()
-    : key_press_counter_references_(0),
-      mouse_listeners_count_(0),
-      mouse_listeners_(new MouseListenerList()) {}
+UserInputMonitor::UserInputMonitor() : key_press_counter_references_(0) {}
 
 UserInputMonitor::~UserInputMonitor() {
   DCHECK_EQ(0u, key_press_counter_references_);
-  mouse_listeners_->AssertEmpty();
-}
-
-void UserInputMonitor::AddMouseListener(MouseEventListener* listener) {
-  mouse_listeners_->AddObserver(listener);
-  {
-    base::AutoLock auto_lock(lock_);
-    mouse_listeners_count_++;
-    if (mouse_listeners_count_ == 1) {
-      StartMouseMonitoring();
-      DVLOG(2) << "Started mouse monitoring.";
-    }
-  }
-}
-
-void UserInputMonitor::RemoveMouseListener(MouseEventListener* listener) {
-  mouse_listeners_->RemoveObserver(listener);
-  {
-    base::AutoLock auto_lock(lock_);
-    DCHECK_NE(mouse_listeners_count_, 0u);
-    mouse_listeners_count_--;
-    if (mouse_listeners_count_ == 0) {
-      StopMouseMonitoring();
-      DVLOG(2) << "Stopped mouse monitoring.";
-    }
-  }
 }
 
 void UserInputMonitor::EnableKeyPressMonitoring() {