Add content-security-policy directive to print-preview pages.

chrome/browser/ui/webui/chrome_web_ui_data_source.cc

 // Copyright (c) 2011 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/webui/chrome_web_ui_data_source.h"
 
 #include <string>
 
 #include "base/memory/ref_counted_memory.h"
 #include "base/string_util.h"
@@ skipping 15 matching lines @@
 
 void ChromeWebUIDataSource::AddLocalizedString(const std::string& name,
                                                int ids) {
   localized_strings_.SetString(name, l10n_util::GetStringUTF16(ids));
 }
 
 std::string ChromeWebUIDataSource::GetMimeType(const std::string& path) const {
   if (EndsWith(path, ".js", false))
     return "application/javascript";
 
+  if (EndsWith(path, ".pdf", false))
+    return "application/pdf";
+
   return "text/html";
 }
 
 void ChromeWebUIDataSource::StartDataRequest(const std::string& path,
                                              bool is_incognito,
                                              int request_id) {
   if (path == json_path_) {
     SendLocalizedStringsAsJSON(request_id);
   } else {
     int resource_id = default_resource_;
@@ skipping 11 matching lines @@
   SetFontAndTextDirection(&localized_strings_);
   jstemplate_builder::AppendJsonJS(&localized_strings_, &template_data);
   SendResponse(request_id, base::RefCountedString::TakeString(&template_data));
 }
 
 void ChromeWebUIDataSource::SendFromResourceBundle(int request_id, int idr) {
   scoped_refptr<RefCountedStaticMemory> response(
       ResourceBundle::GetSharedInstance().LoadDataResourceBytes(idr));
   SendResponse(request_id, response);
 }