Move ImageWindowDelegate to ui/aura_extra

ui/aura_extra/aura_extra.gyp

+# 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.
+
+{
+  'variables': {
+    'chromium_code': 1,
+  },
+  'targets': [
+    {
+      # GN version: //ui/aura_extra
+      'target_name': 'aura_extra',
+      'type': '<(component)',
+      'dependencies': [
+        '../../base/base.gyp:base',
+        '../aura/aura.gyp:aura',
+        '../base/ui_base.gyp:ui_base',
+        '../events/events.gyp:events',
+        '../gfx/gfx.gyp:gfx',
+        '../gfx/gfx.gyp:gfx_geometry',
+      ],
+      'defines': [
+        'AURA_EXTRA_IMPLEMENTATION',
+      ],
+      'sources': [
+        'aura_extra_export.h',
+        'image_window_delegate.cc',
+        'image_window_delegate.h',
+      ],
+    },
+  ],
+}