Allow extensions to specify that they are not allowed in incognito mode.

extensions/common/extension.cc

Index: extensions/common/extension.cc
diff --git a/extensions/common/extension.cc b/extensions/common/extension.cc
index 8aefc6af954bef0c8ff3b23e2b83debd4f06667a..9328ba2f2d85bb8c4191d0d185d848b4ef20a234 100644
--- a/extensions/common/extension.cc
+++ b/extensions/common/extension.cc
@@ -28,6 +28,7 @@
 #include "extensions/common/manifest.h"
 #include "extensions/common/manifest_constants.h"
 #include "extensions/common/manifest_handler.h"
+#include "extensions/common/manifest_handlers/incognito_info.h"
 #include "extensions/common/manifest_handlers/permissions_parser.h"
 #include "extensions/common/permissions/permission_set.h"
 #include "extensions/common/permissions/permissions_data.h"
@@ -438,11 +439,6 @@ bool Extension::is_theme() const {
   return manifest()->is_theme();
 }
 
-bool Extension::can_be_incognito_enabled() const {
-  // Only component platform apps are supported in incognito.
-  return !is_platform_app() || location() == Manifest::COMPONENT;
-}
-
 void Extension::AddWebExtentPattern(const URLPattern& pattern) {
   // Bookmark apps are permissionless.
   if (from_bookmark())