Don't populate URL data in WebDropData when dragging files.

This is considered a potential security issue as well, since it leaks
filesystem paths.

BUG=332579

Review URL: https://codereview.chromium.org/135633002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244538 0039d316-1c4b-4281-b951-d872f2087c98
int WebContentsViewAura::OnPerformDrop(const ui::DropTargetEvent& event) {
  DCHECK(current_rvh_for_drag_);
  if (current_rvh_for_drag_ != web_contents_->GetRenderViewHost())
    OnDragEntered(event);

  web_contents_->GetRenderViewHost()->DragTargetDrop(
      event.location(),
      gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
      ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
  if (drag_dest_delegate_)
    drag_dest_delegate_->OnDrop();
  current_drop_data_.reset();
  return ConvertFromWeb(current_drag_op_);
}

int WebContentsViewAura::OnPerformDrop(const ui::DropTargetEvent& event) {
  DCHECK(current_rvh_for_drag_);
  if (current_rvh_for_drag_ != web_contents_->GetRenderViewHost())
    OnDragEntered(event);

  web_contents_->GetRenderViewHost()->DragTargetDrop(
      event.location(),
      gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
      ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
  if (drag_dest_delegate_)
    drag_dest_delegate_->OnDrop();
  current_drop_data_.reset();
  return ConvertFromWeb(current_drag_op_);
}
