[Local NTP] Fix chrome://large-icon fallback when no favicon is found.

components/favicon_base/favicon_types.h

Index: components/favicon_base/favicon_types.h
diff --git a/components/favicon_base/favicon_types.h b/components/favicon_base/favicon_types.h
index f7c812abcff54c4e1c86bc16b90f56f1af91f2a7..469d0fa10b9890fee0cb5a83dc0aa2d71e8999a7 100644
--- a/components/favicon_base/favicon_types.h
+++ b/components/favicon_base/favicon_types.h
@@ -79,7 +79,11 @@ typedef FaviconRawBitmapResult FaviconRawBitmapData;
 // either the bitmap data if the favicon database has a sufficiently large
 // favicon bitmap and the style of the fallback icon otherwise.
 struct LargeIconResult {
-  LargeIconResult();
+  explicit LargeIconResult(const FaviconRawBitmapResult& bitmap_in);
+
+  // Takes ownership of |fallback_icon_style_in|.
+  explicit LargeIconResult(FallbackIconStyle* fallback_icon_style_in);
+
   ~LargeIconResult();
 
   // The bitmap from the favicon database if the database has a sufficiently