Revert of scheduler: Implement task observers

content/test/fake_renderer_scheduler.cc

Index: content/test/fake_renderer_scheduler.cc
diff --git a/content/test/fake_renderer_scheduler.cc b/content/test/fake_renderer_scheduler.cc
index 829d53013e9041b29d713da2c069b3ee74b2ceef..b38154f0d992c0e9a9ff441bd65c469c64684227 100644
--- a/content/test/fake_renderer_scheduler.cc
+++ b/content/test/fake_renderer_scheduler.cc
@@ -53,14 +53,6 @@
   return false;
 }
 
-void FakeRendererScheduler::AddTaskObserver(
-    base::MessageLoop::TaskObserver* task_observer) {
-}
-
-void FakeRendererScheduler::RemoveTaskObserver(
-    base::MessageLoop::TaskObserver* task_observer) {
-}
-
 void FakeRendererScheduler::Shutdown() {
 }