Add EXTERNAL_POLICY to list of possible extension locations

chrome/browser/background/background_contents_service.cc

Index: chrome/browser/background/background_contents_service.cc
diff --git a/chrome/browser/background/background_contents_service.cc b/chrome/browser/background/background_contents_service.cc
index 9e2230f5befcbfa9b6bb7cb4b0f5c5a3dc5f6983..9ab995cde88b5ace6ef0b9b090a4e497532a22f6 100644
--- a/chrome/browser/background/background_contents_service.cc
+++ b/chrome/browser/background/background_contents_service.cc
@@ -409,8 +409,8 @@ void BackgroundContentsService::Observe(
       if (!extension)
         break;
 
-      const bool force_installed = extension->location() ==
-          extensions::Manifest::EXTERNAL_POLICY_DOWNLOAD;
+      const bool force_installed =
+          extensions::Manifest::IsPolicyLocation(extension->location());
       if (!force_installed) {
         // When an extension crashes, EXTENSION_PROCESS_TERMINATED is followed
         // by an EXTENSION_UNLOADED notification. This UNLOADED signal causes