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
void HomePageUndoBubble::ShowBubble(Browser* browser,
                                    bool undo_value_is_ntp,
                                    const GURL& undo_url,
                                    views::View* anchor_view) {
  HideBubble();
  home_page_undo_bubble_ = new HomePageUndoBubble(browser,
                                                  undo_value_is_ntp,
                                                  undo_url,
                                                  anchor_view);
  views::BubbleDelegateView::CreateBubble(home_page_undo_bubble_);
  home_page_undo_bubble_->StartFade(true);
}

void HomePageUndoBubble::ShowBubble(Browser* browser,
                                    bool undo_value_is_ntp,
                                    const GURL& undo_url,
                                    views::View* anchor_view) {
  HideBubble();
  home_page_undo_bubble_ = new HomePageUndoBubble(browser,
                                                  undo_value_is_ntp,
                                                  undo_url,
                                                  anchor_view);
  views::BubbleDelegateView::CreateBubble(home_page_undo_bubble_);
  home_page_undo_bubble_->StartFade(true);
}
