[Extensions] Fix a bug in the startup pages override bubble

chrome/test/data/extensions/startup_pages/manifest.json

Index: chrome/test/data/extensions/startup_pages/manifest.json
diff --git a/chrome/test/data/extensions/startup_pages/manifest.json b/chrome/test/data/extensions/startup_pages/manifest.json
new file mode 100644
index 0000000000000000000000000000000000000000..05647a694be5a4c9686b560592366441df783549
--- /dev/null
+++ b/chrome/test/data/extensions/startup_pages/manifest.json
@@ -0,0 +1,9 @@
+{
+  "name": "chrome.extension.settings_override",
+  "version": "0.1",
+  "manifest_version": 2,
+  "description": "end-to-end browser test for chrome.settings_override API",
+  "chrome_settings_overrides": {
+    "startup_pages": ["http://www.example.com/?param=__PARAM__"]
+   }
+}