Remove usage of FOR_EACH_OBSERVER macro in ui/compositor/.

ui/compositor/test/in_process_context_factory.cc

Index: ui/compositor/test/in_process_context_factory.cc
diff --git a/ui/compositor/test/in_process_context_factory.cc b/ui/compositor/test/in_process_context_factory.cc
index 77c83c01559b81f83ebea01a44c5ad0452ca769e..4fb3dc70d6603bb3377411bf3685921d7b39ffac 100644
--- a/ui/compositor/test/in_process_context_factory.cc
+++ b/ui/compositor/test/in_process_context_factory.cc
@@ -131,7 +131,8 @@ InProcessContextFactory::~InProcessContextFactory() {
 }
 
 void InProcessContextFactory::SendOnLostResources() {
-  FOR_EACH_OBSERVER(ContextFactoryObserver, observer_list_, OnLostResources());
+  for (auto& observer : observer_list_)
+    observer.OnLostResources();
 }
 
 void InProcessContextFactory::CreateCompositorFrameSink(