Correctly whitelist the PDF plugin in the PDF extension.

chrome/browser/content_settings/content_settings_internal_extension_provider.cc

 // Copyright (c) 2013 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/content_settings/content_settings_internal_extension_provider.h"
 
+#include "chrome/browser/pdf/pdf_extension_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_content_client.h"
 #include "chrome/common/extensions/api/plugins/plugins_handler.h"
 #include "components/content_settings/core/browser/content_settings_rule.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_service.h"
 #include "extensions/browser/extension_host.h"
 #include "extensions/browser/extension_registry.h"
@@ skipping 167 matching lines @@
   // above check does not catch this, as the plugin is a builtin plugin.
   if (chrome_remote_desktop_.find(extension->id()) !=
       chrome_remote_desktop_.end()) {
     SetContentSettingForExtensionAndResource(
         extension, ChromeContentClient::kRemotingViewerPluginPath, setting);
   }
 
   // The PDF viewer extension relies on the out of process PDF plugin.
   if (extension->id() == extension_misc::kPdfExtensionId) {
     SetContentSettingForExtensionAndResource(
-        extension, ChromeContentClient::kPDFPluginPath, setting);
+        extension, pdf_extension_util::kPdfResourceIdentifier, setting);
   }
 }
 
 void InternalExtensionProvider::SetContentSettingForExtension(
     const extensions::Extension* extension,
     ContentSetting setting) {
   SetContentSettingForExtensionAndResource(
       extension, ResourceIdentifier(), setting);
 }
 
@@ skipping 24 matching lines @@
                           new base::FundamentalValue(setting));
     }
   }
   NotifyObservers(primary_pattern,
                   secondary_pattern,
                   CONTENT_SETTINGS_TYPE_PLUGINS,
                   resource);
 }
 
 }  // namespace content_settings