Exempt component and policy-installed extensions from policy blacklist check.

chrome/browser/extensions/extension_prefs.cc

Index: chrome/browser/extensions/extension_prefs.cc
diff --git a/chrome/browser/extensions/extension_prefs.cc b/chrome/browser/extensions/extension_prefs.cc
index c5f03f2cf9fc4ad1fb707db85bdbc797a70b436b..56d410cbab49c7fa1ec796412ee4b9c4991b8a70 100644
--- a/chrome/browser/extensions/extension_prefs.cc
+++ b/chrome/browser/extensions/extension_prefs.cc
@@ -11,10 +11,10 @@
 #include "chrome/browser/prefs/pref_notifier.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/common/chrome_notification_types.h"
-#include "chrome/common/url_constants.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/url_pattern.h"
 #include "chrome/common/pref_names.h"
+#include "chrome/common/url_constants.h"
 #include "content/public/browser/notification_service.h"
 
 using base::Time;
@@ -587,9 +587,15 @@ bool ExtensionPrefs::SetAlertSystemFirstRun() {
 }
 
 bool ExtensionPrefs::IsExtensionAllowedByPolicy(
-    const std::string& extension_id) {
+    const std::string& extension_id,
+    Extension::Location location) {
   std::string string_value;
 
+  if (location == Extension::COMPONENT ||
+      location == Extension::EXTERNAL_POLICY_DOWNLOAD) {
+    return true;
+  }
+
   const ListValue* blacklist =
       prefs_->GetList(prefs::kExtensionInstallDenyList);
   if (!blacklist || blacklist->empty())