Properly fall back to manifest short_name when name is empty.

chrome/test/data/banners/manifest_empty_name.json

Index: chrome/test/data/banners/manifest_empty_name.json
diff --git a/chrome/test/data/banners/manifest_empty_name.json b/chrome/test/data/banners/manifest_empty_name.json
new file mode 100644
index 0000000000000000000000000000000000000000..07b5ae5a8159ca64afbbc4de9a4f5a31f4ea3c0b
--- /dev/null
+++ b/chrome/test/data/banners/manifest_empty_name.json
@@ -0,0 +1,39 @@
+{
+  "short_name": "Manifest",
+  "name": "",
+  "icons": [
+    {
+      "src": "launcher-icon-1x.png",
+      "sizes": "48x48",
+      "type": "image/png"
+    },
+    {
+      "src": "launcher-icon-1-5x.png",
+      "sizes": "72x72",
+      "type": "image/png"
+    },
+    {
+      "src": "launcher-icon-2x.png",
+      "sizes": "96x96",
+      "type": "image/png"
+    },
+    {
+      "src": "launcher-icon-3x.png",
+      "sizes": "144x144",
+      "type": "image/png"
+    },
+    {
+      "src": "launcher-icon-4x.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "image-512px.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ],
+  "start_url": "manifest_test_page.html",
+  "display": "standalone",
+  "orientation": "landscape"
+}