Fix obsolete comment in ash::ShellDelegate

CreateScreenshotDelegate does not need a mojo-compatible delegate.
That comment is left over from the mustash project.

Bug: none
Change-Id: Ie0eb0a89687abc9366903f982f8755d051b60c16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382397
Commit-Queue: James Cook <jamescook@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Auto-Submit: James Cook <jamescook@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802764}

ash/shell_delegate.h

@@ -49,7 +49,7 @@ class ASH_EXPORT ShellDelegate {
   virtual std::unique_ptr<CaptureModeDelegate> CreateCaptureModeDelegate()
       const = 0;
 
-  // TODO(jamescook): Replace with a mojo-compatible interface.
+  // Creates the screenshot delegate, which has dependencies on //chrome.
   virtual std::unique_ptr<ScreenshotDelegate> CreateScreenshotDelegate() = 0;
 
   // Creates a accessibility delegate. Shell takes ownership of the delegate.