Always trust internal PDF viewer.

chrome/browser/resources/plugins.js

Index: chrome/browser/resources/plugins.js
diff --git a/chrome/browser/resources/plugins.js b/chrome/browser/resources/plugins.js
index 4787c5c84f67f4f30e86f324b972a78cd20bcd6c..3301f2f85250012690da1c48055551ba6bf3fe95 100644
--- a/chrome/browser/resources/plugins.js
+++ b/chrome/browser/resources/plugins.js
@@ -242,6 +242,15 @@ function isPluginEnabled(plugin) {
 }
 
 /**
+ * @param {Object} plugin An object containing the information about a plugin.
+ *     See returnPluginsData() for the format of this object.
+ * @return {boolean} Whether the plugin is fully trusted.
+ */
+function isPluginTrusted(plugin) {
+ return plugin.trusted == true;
+}
+
+/**
  * Helper to convert callback-based define() API to a promise-based API.
  * @param {!Array<string>} moduleNames
  * @return {!Promise}