[WebAPKs] Fix WebAPK updates when Web Manifest does not specify color

chrome/browser/android/webapk/webapk_update_manager.cc

Index: chrome/browser/android/webapk/webapk_update_manager.cc
diff --git a/chrome/browser/android/webapk/webapk_update_manager.cc b/chrome/browser/android/webapk/webapk_update_manager.cc
index be9ab62d528e131e600ba8afc880fa53872edb00..8c3bcce44941afbba5ca0dd23419769f24302f11 100644
--- a/chrome/browser/android/webapk/webapk_update_manager.cc
+++ b/chrome/browser/android/webapk/webapk_update_manager.cc
@@ -83,8 +83,8 @@ static void UpdateAsync(
   info.display = static_cast<blink::WebDisplayMode>(java_display_mode);
   info.orientation =
       static_cast<blink::WebScreenOrientationLockType>(java_orientation);
-  info.theme_color = (long)java_theme_color;
-  info.background_color = (long)java_background_color;
+  info.theme_color = (int64_t)java_theme_color;
+  info.background_color = (int64_t)java_background_color;
   info.best_primary_icon_url = best_primary_icon_url;
   info.manifest_url = web_manifest_url;