diff --git a/atom/browser/ui/webui/pdf_viewer_ui.cc b/atom/browser/ui/webui/pdf_viewer_ui.cc
index fd0e4a71d740..0a8d95a9f3c8 100644
--- a/atom/browser/ui/webui/pdf_viewer_ui.cc
+++ b/atom/browser/ui/webui/pdf_viewer_ui.cc
@@ -114,7 +114,7 @@ class PdfViewerUI::ResourceRequester
                                         BrowserThread::DeleteOnIOThread>,
       public atom::LayeredResourceHandler::Delegate {
  public:
-  ResourceRequester(StreamResponseCallback cb)
+  explicit ResourceRequester(StreamResponseCallback cb)
       : stream_response_cb_(std::move(cb)) {}
 
   void StartRequest(const GURL& url,
diff --git a/spec/chromium-spec.js b/spec/chromium-spec.js
index 07ff7335be68..1c92f9537103 100644
--- a/spec/chromium-spec.js
+++ b/spec/chromium-spec.js
@@ -827,7 +827,6 @@ describe('chromium feature', function () {
         assert.equal(parsedURL.protocol, 'chrome:')
         assert.equal(parsedURL.hostname, 'pdf-viewer')
         assert.equal(parsedURL.query.src, pdfSource)
-        assert(!!parsedURL.query.streamId.length)
       })
       w.webContents.on('page-title-updated', function () {
         assert.equal(w.webContents.getTitle(), 'PDF')