Cleanup DesktopMediaPicker

chrome/browser/ui/cocoa/media_picker/desktop_media_picker_cocoa.mm

Index: chrome/browser/ui/cocoa/media_picker/desktop_media_picker_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/media_picker/desktop_media_picker_cocoa.mm b/chrome/browser/ui/cocoa/media_picker/desktop_media_picker_cocoa.mm
index 8708f3ab246951269980c5e38414b55b60b05ce5..2fefce6f2bbc8c449d014f0e3263b1aa0768fcc2 100644
--- a/chrome/browser/ui/cocoa/media_picker/desktop_media_picker_cocoa.mm
+++ b/chrome/browser/ui/cocoa/media_picker/desktop_media_picker_cocoa.mm
@@ -13,18 +13,16 @@ DesktopMediaPickerCocoa::~DesktopMediaPickerCocoa() {
 }
 
 void DesktopMediaPickerCocoa::Show(content::WebContents* web_contents,
-                                   gfx::NativeWindow context,
-                                   gfx::NativeWindow parent,
                                    const base::string16& app_name,
                                    const base::string16& target_name,
                                    scoped_ptr<DesktopMediaList> media_list,
                                    const DoneCallback& done_callback) {
-  controller_.reset(
-      [[DesktopMediaPickerController alloc] initWithMediaList:media_list.Pass()
-                                                       parent:parent
-                                                     callback:done_callback
-                                                      appName:app_name
-                                                   targetName:target_name]);
+  controller_.reset([[DesktopMediaPickerController alloc]
+      initWithMediaList:media_list.Pass()
+                 parent:web_contents->GetTopLevelNativeWindow()
+               callback:done_callback
+                appName:app_name
+             targetName:target_name]);
   [controller_ showWindow:nil];
 }