Replace the WAS_INSTALLED_BY_CUSTODIAN creation flag with a pref

chrome/browser/extensions/pending_extension_manager.h

Index: chrome/browser/extensions/pending_extension_manager.h
diff --git a/chrome/browser/extensions/pending_extension_manager.h b/chrome/browser/extensions/pending_extension_manager.h
index cd2dcb2128bbc7ef3dfbf9ae305a37f18d0e2bbb..627077b14101f00c08861f561567eaf77ec5addb 100644
--- a/chrome/browser/extensions/pending_extension_manager.h
+++ b/chrome/browser/extensions/pending_extension_manager.h
@@ -80,8 +80,7 @@ class PendingExtensionManager {
       const GURL& update_url,
       const base::Version& version,
       PendingExtensionInfo::ShouldAllowInstallPredicate should_allow_install,
-      bool remote_install,
-      bool installed_by_custodian);
+      bool remote_install);
 
   // Adds an extension that was depended on by another extension.
   bool AddFromExtensionImport(