Added enhanced bookmarks extension as an external component extension

extensions/common/extension.cc

Index: extensions/common/extension.cc
diff --git a/extensions/common/extension.cc b/extensions/common/extension.cc
index f38d547a0f322301e78f7b629fe64c5a1e4c07b5..aef22cc036ccfbd3a115662c4a8d89b77e184f43 100644
--- a/extensions/common/extension.cc
+++ b/extensions/common/extension.cc
@@ -368,9 +368,10 @@ bool Extension::ShouldDisplayInExtensionSettings() const {
 bool Extension::ShouldNotBeVisible() const {
   // Don't show component extensions because they are only extensions as an
   // implementation detail of Chrome.
-  if (location() == Manifest::COMPONENT &&
+  if ((location() == Manifest::COMPONENT ||
+       location() == Manifest::EXTERNAL_COMPONENT) &&
       !CommandLine::ForCurrentProcess()->HasSwitch(
-        switches::kShowComponentExtensionOptions)) {
+          switches::kShowComponentExtensionOptions)) {
     return true;
   }