Replace the WAS_INSTALLED_BY_CUSTODIAN creation flag with a pref

chrome/browser/extensions/pending_extension_info.h

Index: chrome/browser/extensions/pending_extension_info.h
diff --git a/chrome/browser/extensions/pending_extension_info.h b/chrome/browser/extensions/pending_extension_info.h
index 9d4e939180e34a55fbb5592cef1260f760f6fd68..8bfcdaa9707698d7b30e67678164f2d15fc475d0 100644
--- a/chrome/browser/extensions/pending_extension_info.h
+++ b/chrome/browser/extensions/pending_extension_info.h
@@ -34,7 +34,6 @@ class PendingExtensionInfo {
                        ShouldAllowInstallPredicate should_allow_install,
                        bool is_from_sync,
                        Manifest::Location install_source,
-                       int creation_flags,
                        bool mark_acknowledged,
                        bool remote_install);
 
@@ -64,7 +63,6 @@ class PendingExtensionInfo {
   }
   bool is_from_sync() const { return is_from_sync_; }
   Manifest::Location install_source() const { return install_source_; }
-  int creation_flags() const { return creation_flags_; }
   bool mark_acknowledged() const { return mark_acknowledged_; }
   bool remote_install() const { return remote_install_; }
 
@@ -89,7 +87,6 @@ class PendingExtensionInfo {
 
   bool is_from_sync_;  // This update check was initiated from sync.
   Manifest::Location install_source_;
-  int creation_flags_;
   bool mark_acknowledged_;
   bool remote_install_;