Replace the WAS_INSTALLED_BY_CUSTODIAN creation flag with a pref

chrome/browser/extensions/pending_extension_manager.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_PENDING_EXTENSION_MANAGER_H_
 #define CHROME_BROWSER_EXTENSIONS_PENDING_EXTENSION_MANAGER_H_
 
 #include <list>
 #include <string>
 
@@ skipping 62 matching lines @@
   // if the extension is pending from another source which overrides
   // sync installs (such as a policy extension) or if the extension
   // is already installed.
   // After installation, the extension will be granted permissions iff
   // |version| is valid and matches the actual installed version.
   bool AddFromSync(
       const std::string& id,
       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(
       const std::string& id,
       const GURL& update_url,
       PendingExtensionInfo::ShouldAllowInstallPredicate should_allow_install);
 
   // Given an extension id and an update URL, schedule the extension
   // to be fetched, installed, and activated.
   bool AddFromExternalUpdateUrl(const std::string& id,
@@ skipping 52 matching lines @@
   friend void SetupPendingExtensionManagerForTest(
       int count, const GURL& update_url,
       PendingExtensionManager* pending_extension_manager);
 
   DISALLOW_COPY_AND_ASSIGN(PendingExtensionManager);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_PENDING_EXTENSION_MANAGER_H_