If JavaScript shows a dialog, cause the page to lose fullscreen.

BUG=670135, 550017, 726761, 728276

Review-Url: https://codereview.chromium.org/2906133004
Cr-Commit-Position: refs/heads/master@{#478884}
PrintingContextDelegate::PrintingContextDelegate(int render_process_id,
                                                 int render_frame_id)
    : render_process_id_(render_process_id),
      render_frame_id_(render_frame_id) {}

PrintingContextDelegate::PrintingContextDelegate(int render_process_id,
                                                 int render_frame_id)
    : render_process_id_(render_process_id),
      render_frame_id_(render_frame_id) {}
