Replace the WAS_INSTALLED_BY_CUSTODIAN creation flag with a pref

extensions/browser/extension_prefs.cc

Index: extensions/browser/extension_prefs.cc
diff --git a/extensions/browser/extension_prefs.cc b/extensions/browser/extension_prefs.cc
index f18fad80e3d2020704f25d8482d0aedc3852167c..7333297f072dc3e6b64bf6e894b84aa61b999115 100644
--- a/extensions/browser/extension_prefs.cc
+++ b/extensions/browser/extension_prefs.cc
@@ -122,6 +122,10 @@ const char kPrefAllowFileAccess[] = "newAllowFileAccess";
 // the old flag and possibly go back to that name.
 // const char kPrefAllowFileAccessOld[] = "allowFileAccess";
 
+// A preference that is relevant only for supervised users
+// and used to flag an extension as installed by custodian.
+const char kPrefWasInstalledByCustodian[] = "wasInstalledByCustodian";
+
 // A preference specifying if the user dragged the app on the NTP.
 const char kPrefUserDraggedApp[] = "user_dragged_app_ntp";
 
@@ -1041,6 +1045,17 @@ bool ExtensionPrefs::HasAllowFileAccessSetting(
   return ext && ext->HasKey(kPrefAllowFileAccess);
 }
 
+bool ExtensionPrefs::WasInstalledByCustodian(
+    const std::string& extension_id) const {
+  return ReadPrefAsBooleanAndReturn(extension_id, kPrefWasInstalledByCustodian);
+}
+
+void ExtensionPrefs::SetWasInstalledByCustodian(const std::string& extension_id,
+                                                bool installed_by_custodian) {
+  UpdateExtensionPref(extension_id, kPrefWasInstalledByCustodian,
+                      new base::FundamentalValue(installed_by_custodian));
+}
+
 bool ExtensionPrefs::DoesExtensionHaveState(
     const std::string& id, Extension::State check_state) const {
   const base::DictionaryValue* extension = GetExtensionPref(id);