Fix font preload crash

third_party/WebKit/Source/core/loader/DocumentLoader.cpp

Index: third_party/WebKit/Source/core/loader/DocumentLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
index 3174db9c2d4fe40c4af611ad267f8fde9c93c1db..1f194811a1ba49e00728189d346ed50527c6b2c3 100644
--- a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
@@ -173,7 +173,8 @@ Resource* DocumentLoader::startPreload(Resource::Type type, FetchRequest& reques
     case Resource::Font:
         resource = FontResource::fetch(request, fetcher());
         // This is needed for fonts as loading doesn't start until there's usage.
-        toFontResource(resource)->beginLoadIfNeeded(fetcher());
+        if (resource)
+            toFontResource(resource)->beginLoadIfNeeded(fetcher());
         break;
     case Resource::Media:
         resource = RawResource::fetchMedia(request, fetcher());