Directly inline shared WebUI CSS declarations into the security and supervised user interstitials.

chrome/browser/supervised_user/supervised_user_interstitial.cc

 // Copyright 2014 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/supervised_user/supervised_user_interstitial.h"
 
 #include "base/memory/weak_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 251 matching lines @@
     request_sent_message = l10n_util::GetStringFUTF16(
         IDS_BLOCK_INTERSTITIAL_REQUEST_SENT_MESSAGE, custodian);
     request_failed_message = l10n_util::GetStringFUTF16(
         IDS_BLOCK_INTERSTITIAL_REQUEST_FAILED_MESSAGE, custodian);
   }
   strings.SetString("requestSentMessage", request_sent_message);
   strings.SetString("requestFailedMessage", request_failed_message);
 
   webui::SetFontAndTextDirection(&strings);
 
-  base::StringPiece html(ResourceBundle::GetSharedInstance().GetRawDataResource(
-      IDR_SUPERVISED_USER_BLOCK_INTERSTITIAL_HTML));
+  std::string html =
+      ResourceBundle::GetSharedInstance()
+          .GetRawDataResource(IDR_SUPERVISED_USER_BLOCK_INTERSTITIAL_HTML)
+          .as_string();
+  webui::AppendWebUiCssTextDefaults(&html);
 
   return webui::GetI18nTemplateHtml(html, &strings);
 }
 
 void SupervisedUserInterstitial::CommandReceived(const std::string& command) {
   // For use in histograms.
   enum Commands {
     PREVIEW,
     BACK,
     NTP,
@@ skipping 96 matching lines @@
       SupervisedUserServiceFactory::GetForProfile(profile_);
   supervised_user_service->RemoveObserver(this);
 
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE, base::Bind(callback_, continue_request));
 
   // After this, the WebContents may be destroyed. Make sure we don't try to use
   // it again.
   web_contents_ = NULL;
 }