"up-to-date" should only use hyphens when used as compound modifier of a noun

chrome/browser/ui/pdf/pdf_unsupported_feature.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/pdf/pdf_unsupported_feature.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 194 matching lines @@
       return;
     }
 
     if (command == "1") {
       content::RecordAction(
           UserMetricsAction("PDF_ReaderInterstitialUpdate"));
       OpenReaderUpdateURL(web_contents_);
     } else if (command == "2") {
       content::RecordAction(
           UserMetricsAction("PDF_ReaderInterstitialIgnore"));
-      // Pretend that the plugin is up-to-date so that we don't block it.
+      // Pretend that the plugin is up to date so that we don't block it.
       reader_webplugininfo_.version = base::ASCIIToUTF16("11.0.0.0");
       OpenUsingReader(web_contents_, reader_webplugininfo_, NULL);
     } else {
       NOTREACHED();
     }
     interstitial_page_->Proceed();
   }
 
   void OverrideRendererPrefs(content::RendererPreferences* prefs) override {
     Profile* profile =
@@ skipping 131 matching lines @@
     MaybeShowOpenPDFInReaderPrompt(web_contents, reader_info);
     return;
   }
   GetAdobeReaderPluginInfoAsync(
       profile,
       base::Bind(&GotPluginsCallback,
                  web_contents->GetRenderProcessHost()->GetID(),
                  web_contents->GetRenderViewHost()->GetRoutingID()));
 #endif  // defined(OS_WIN)
 }