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
void PrintPreviewHandler::SendFailedToGetPrinterCapabilities(
    const std::string& printer_name) {
  VLOG(1) << "Get printer capabilities failed";
  base::StringValue printer_name_value(printer_name);
  web_ui()->CallJavascriptFunction("failedToGetPrinterCapabilities",
                                   printer_name_value);
}

void PrintPreviewHandler::SendFailedToGetPrinterCapabilities(
    const std::string& printer_name) {
  VLOG(1) << "Get printer capabilities failed";
  base::StringValue printer_name_value(printer_name);
  web_ui()->CallJavascriptFunction("failedToGetPrinterCapabilities",
                                   printer_name_value);
}
