[MediaStream] Pass request ID parameters in the right order for OpenDevice()

Prior to this CL, requester_id and page_request_id parameters were
passed in incorrect order from MediaStreamDispatcherHost to
MediaStreamManager for the OpenDevice() operation, which could lead to
errors.

Bug: 948564
Change-Id: Iadcf3fe26adaac50564102138ce212269cf32d62
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1569113
Reviewed-by: Marina Ciocea <marinaciocea@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#651255}
void MediaStreamDispatcherHost::Create(
    int render_process_id,
    int render_frame_id,
    MediaStreamManager* media_stream_manager,
    blink::mojom::MediaStreamDispatcherHostRequest request) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  mojo::MakeStrongBinding(
      std::make_unique<MediaStreamDispatcherHost>(
          render_process_id, render_frame_id, media_stream_manager),
      std::move(request));
}

void MediaStreamDispatcherHost::Create(
    int render_process_id,
    int render_frame_id,
    MediaStreamManager* media_stream_manager,
    blink::mojom::MediaStreamDispatcherHostRequest request) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  mojo::MakeStrongBinding(
      std::make_unique<MediaStreamDispatcherHost>(
          render_process_id, render_frame_id, media_stream_manager),
      std::move(request));
}
