Extract NativeAppWindow from src/extensions

extensions/renderer/extension_helper.cc

Index: extensions/renderer/extension_helper.cc
diff --git a/extensions/renderer/extension_helper.cc b/extensions/renderer/extension_helper.cc
index e9da0f58ea5c8ee461d90fb034212e87a2c72220..49b240fe8ad01349725d75e7a474be5420742aa8 100644
--- a/extensions/renderer/extension_helper.cc
+++ b/extensions/renderer/extension_helper.cc
@@ -159,9 +159,9 @@ void ExtensionHelper::DidCreateDocumentElement(WebLocalFrame* frame) {
 void ExtensionHelper::DraggableRegionsChanged(blink::WebFrame* frame) {
   blink::WebVector<blink::WebDraggableRegion> webregions =
       frame->document().draggableRegions();
-  std::vector<DraggableRegion> regions;
+  std::vector<native_app_window::DraggableRegion> regions;
   for (size_t i = 0; i < webregions.size(); ++i) {
-    DraggableRegion region;
+    native_app_window::DraggableRegion region;
     region.bounds = webregions[i].bounds;
     region.draggable = webregions[i].draggable;
     regions.push_back(region);