Move ImageWindowDelegate to ui/aura_extra

ui/aura_extra/BUILD.gn

Index: ui/aura_extra/BUILD.gn
diff --git a/ui/aura_extra/BUILD.gn b/ui/aura_extra/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..d82d54771d9df68164cec9bf3c93d1a9e8f9171c
--- /dev/null
+++ b/ui/aura_extra/BUILD.gn
@@ -0,0 +1,24 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/ui.gni")
+
+component("aura_extra") {
+  sources = [
+    "aura_extra_export.h",
+    "image_window_delegate.cc",
+    "image_window_delegate.h",
+  ]
+
+  defines = [ "AURA_EXTRA_IMPLEMENTATION" ]
+
+  deps = [
+    "//base",
+    "//ui/aura",
+    "//ui/base",
+    "//ui/events",
+    "//ui/gfx",
+    "//ui/gfx/geometry",
+  ]
+}