Log messages regarding why app banners aren't displayed to the console

chrome/browser/banners/app_banner_data_fetcher_unittest.cc

Index: chrome/browser/banners/app_banner_data_fetcher_unittest.cc
diff --git a/chrome/browser/banners/app_banner_data_fetcher_unittest.cc b/chrome/browser/banners/app_banner_data_fetcher_unittest.cc
index 2254130433b6c01e5066a7bc7d6489e2f5686cfa..3b68086d4912238f6ee11abb69a89a93ed16820b 100644
--- a/chrome/browser/banners/app_banner_data_fetcher_unittest.cc
+++ b/chrome/browser/banners/app_banner_data_fetcher_unittest.cc
@@ -33,7 +33,10 @@ class AppBannerDataFetcherUnitTest : public testing::Test {
   }
 
   static bool IsManifestValid(const content::Manifest& manifest) {
-    return AppBannerDataFetcher::IsManifestValidForWebApp(manifest);
+    // The second argument is the web_contents pointer, which is used for
+    // developer debug logging to the console. The logging is skipped inside the
+    // method if a null web_contents pointer is provided, so this is safe.
+    return AppBannerDataFetcher::IsManifestValidForWebApp(manifest, nullptr);
   }
 };