[App banners] Add browser test for canceling banners

chrome/browser/banners/app_banner_data_fetcher.cc

Index: chrome/browser/banners/app_banner_data_fetcher.cc
diff --git a/chrome/browser/banners/app_banner_data_fetcher.cc b/chrome/browser/banners/app_banner_data_fetcher.cc
index 587f61a8f38e82b815483b12cd0f9b20f1446e73..66faab4c2215a56acce6f8292e1c4c964ade8acc 100644
--- a/chrome/browser/banners/app_banner_data_fetcher.cc
+++ b/chrome/browser/banners/app_banner_data_fetcher.cc
@@ -140,7 +140,6 @@ void AppBannerDataFetcher::OnBannerPromptReply(
     Cancel();
     return;
   }
-  is_active_ = false;
 
   // The renderer might have requested the prompt to be canceled.
   if (reply == blink::WebAppBannerPromptReply::Cancel) {
@@ -159,6 +158,7 @@ void AppBannerDataFetcher::OnBannerPromptReply(
     InfoBarService::FromWebContents(web_contents)->AddInfoBar(
         make_scoped_ptr(infobar));
   }
+  is_active_ = false;
 }
 
 AppBannerDataFetcher::~AppBannerDataFetcher() {