Print preview: Use an ID instead of memory pointer string in WebUI.

BUG=144051

Review URL: https://chromiumcodereview.appspot.com/10870003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@153342 0039d316-1c4b-4281-b951-d872f2087c98
bool PrintingNodeOrPdfFrame(const WebFrame* frame, const WebNode& node) {
  if (!node.isNull())
    return true;
  if (!frame->document().isPluginDocument())
    return false;
  WebPlugin* plugin = frame->document().to<WebPluginDocument>().plugin();
  return plugin && plugin->supportsPaginatedPrint();
}

bool PrintingNodeOrPdfFrame(const WebFrame* frame, const WebNode& node) {
  if (!node.isNull())
    return true;
  if (!frame->document().isPluginDocument())
    return false;
  WebPlugin* plugin = frame->document().to<WebPluginDocument>().plugin();
  return plugin && plugin->supportsPaginatedPrint();
}
