Skip Service workers in requests for mime handler plugins

BUG=808838
TEST=./browser_tests --gtest_filter=*/ServiceWorkerTest.MimeHandlerView*

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I82e75c200091babbab648a04232db47e2938d914
Reviewed-on: https://chromium-review.googlesource.com/914150
Commit-Queue: Rob Wu <rob@robwu.nl>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537386}
void MimeHandlerViewContainer::DidResizeElement(const gfx::Size& new_size) {
  element_size_ = new_size;

  CreateMimeHandlerViewGuestIfNecessary();

  if (!guest_created_)
    return;

  render_frame()->Send(new ExtensionsGuestViewHostMsg_ResizeGuest(
      render_frame()->GetRoutingID(), element_instance_id(), new_size));
}

void MimeHandlerViewContainer::DidResizeElement(const gfx::Size& new_size) {
  element_size_ = new_size;

  CreateMimeHandlerViewGuestIfNecessary();

  if (!guest_created_)
    return;

  render_frame()->Send(new ExtensionsGuestViewHostMsg_ResizeGuest(
      render_frame()->GetRoutingID(), element_instance_id(), new_size));
}
