Make a pure mojo::View version of the aura::Window FocusController.

sky/tools/debugger/BUILD.gn

Index: sky/tools/debugger/BUILD.gn
diff --git a/sky/tools/debugger/BUILD.gn b/sky/tools/debugger/BUILD.gn
index 199269cc46c2cf1ebed6e0786cc7fc71761604d6..72a4a1b076d1a67a551edd2bd2744491a67f990c 100644
--- a/sky/tools/debugger/BUILD.gn
+++ b/sky/tools/debugger/BUILD.gn
@@ -17,8 +17,6 @@ shared_library("sky_debugger") {
   sources = [
     "debugger.cc",
     "debugger.h",
-    "focus_rules.cc",
-    "focus_rules.h",
     "main.cc",
     "navigator_host_impl.cc",
     "navigator_host_impl.h",
@@ -37,8 +35,6 @@ shared_library("sky_debugger") {
     "//mojo/services/public/interfaces/navigation",
     "//mojo/services/window_manager:lib",
     "//sky/viewer:bindings",
-    "//ui/aura:aura",
-    "//ui/wm:wm",
     ":bindings",
   ]
 }