Modify experimental identity flow to display scope descriptions and details.

chrome/browser/extensions/extension_prefs.cc

Index: chrome/browser/extensions/extension_prefs.cc
diff --git a/chrome/browser/extensions/extension_prefs.cc b/chrome/browser/extensions/extension_prefs.cc
index 93378302def373cecd331cdd8b81de8a2f99dba4..fa33df4b7d52cc4c27fc8a20eb99efa055c018b9 100644
--- a/chrome/browser/extensions/extension_prefs.cc
+++ b/chrome/browser/extensions/extension_prefs.cc
@@ -925,6 +925,24 @@ void ExtensionPrefs::AddGrantedPermissions(
       extension_id, kPrefGrantedPermissions, new_perms.get());
 }
 
+void ExtensionPrefs::RemoveGrantedPermissions(
+    const std::string& extension_id,
+    const ExtensionPermissionSet* permissions) {
+  CHECK(Extension::IdIsValid(extension_id));
+
+  scoped_refptr<ExtensionPermissionSet> granted_permissions(
+      GetGrantedPermissions(extension_id));
+
+  // The new granted permissions are the difference of the already granted
+  // permissions and the newly ungranted permissions.
+  scoped_refptr<ExtensionPermissionSet> new_perms(
+      ExtensionPermissionSet::CreateDifference(
+          granted_permissions.get(), permissions));
+
+  SetExtensionPrefPermissionSet(
+      extension_id, kPrefGrantedPermissions, new_perms.get());
+}
+
 ExtensionPermissionSet* ExtensionPrefs::GetActivePermissions(
     const std::string& extension_id) {
   CHECK(Extension::IdIsValid(extension_id));