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..7fed3b52d32e015c978c81c4752787e4ff17d873 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 kPrefIsInstalledByCustodian[] = "isInstalledByCustodian";
+
 // A preference specifying if the user dragged the app on the NTP.
 const char kPrefUserDraggedApp[] = "user_dragged_app_ntp";
 
@@ -1041,6 +1045,23 @@ bool ExtensionPrefs::HasAllowFileAccessSetting(
   return ext && ext->HasKey(kPrefAllowFileAccess);
 }
 
+bool ExtensionPrefs::IsInstalledByCustodian(
+    const std::string& extension_id) const {
+  return ReadPrefAsBooleanAndReturn(extension_id, kPrefIsInstalledByCustodian);
+}
+
+void ExtensionPrefs::SetIsInstalledByCustodian(const std::string& extension_id,
+                                               bool installed_by_custodian) {
+  UpdateExtensionPref(extension_id, kPrefIsInstalledByCustodian,
+                      new base::FundamentalValue(installed_by_custodian));
+}
+
+bool ExtensionPrefs::HasIsInstalledByCustodianSetting(
+    const std::string& extension_id) const {
+  const base::DictionaryValue* ext = GetExtensionPref(extension_id);
+  return ext && ext->HasKey(kPrefIsInstalledByCustodian);
+}
+
 bool ExtensionPrefs::DoesExtensionHaveState(
     const std::string& id, Extension::State check_state) const {
   const base::DictionaryValue* extension = GetExtensionPref(id);