Changes code using Compositor to pass in ContextFactory

ash/host/ash_window_tree_host_init_params.cc

Index: ash/host/ash_window_tree_host_init_params.cc
diff --git a/ash/host/ash_window_tree_host_init_params.cc b/ash/host/ash_window_tree_host_init_params.cc
index 55d15c03cbca2a27186cbb067667b95237c1d4d0..95dc988bc58920963ab37ad679983cbd1dcbcbe3 100644
--- a/ash/host/ash_window_tree_host_init_params.cc
+++ b/ash/host/ash_window_tree_host_init_params.cc
@@ -6,12 +6,12 @@
 
 namespace ash {
 
+AshWindowTreeHostInitParams::AshWindowTreeHostInitParams()
+    : context_factory(NULL)
 #if defined(OS_WIN)
-AshWindowTreeHostInitParams::AshWindowTreeHostInitParams() : remote_hwnd(NULL) {
-#else
-AshWindowTreeHostInitParams::AshWindowTreeHostInitParams() {
+    , remote_hwnd(NULL)
 #endif
-}
+      {}
 
 AshWindowTreeHostInitParams::~AshWindowTreeHostInitParams() {
 }