Converts more services to use aura-mus

mash/webtest/webtest.h

Index: mash/webtest/webtest.h
diff --git a/mash/webtest/webtest.h b/mash/webtest/webtest.h
index 3a54053a22769cbbcdc6892086fef8b8ce00ad55..b031d7a5411a0b1f7f5ba9e12f5724da3369bed2 100644
--- a/mash/webtest/webtest.h
+++ b/mash/webtest/webtest.h
@@ -17,7 +17,6 @@
 namespace views {
 class AuraInit;
 class Widget;
-class WindowManagerConnection;
 }
 
 namespace mash {
@@ -51,7 +50,6 @@ class Webtest : public service_manager::Service,
 
   tracing::Provider tracing_;
   std::unique_ptr<views::AuraInit> aura_init_;
-  std::unique_ptr<views::WindowManagerConnection> window_manager_connection_;
 
   DISALLOW_COPY_AND_ASSIGN(Webtest);
 };