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
ui::DropTargetEvent* BrowserRootView::MapEventToTabStrip(
    const ui::DropTargetEvent& event,
    const ui::OSExchangeData& data) {
  gfx::Point tab_strip_loc(event.location());
  ConvertPointToTarget(this, tabstrip(), &tab_strip_loc);
  return new ui::DropTargetEvent(data, tab_strip_loc, tab_strip_loc,
                                 event.source_operations());
}

ui::DropTargetEvent* BrowserRootView::MapEventToTabStrip(
    const ui::DropTargetEvent& event,
    const ui::OSExchangeData& data) {
  gfx::Point tab_strip_loc(event.location());
  ConvertPointToTarget(this, tabstrip(), &tab_strip_loc);
  return new ui::DropTargetEvent(data, tab_strip_loc, tab_strip_loc,
                                 event.source_operations());
}
