Create test fixture for SafeBrowsingService

chrome/browser/download/download_danger_prompt.cc

Index: chrome/browser/download/download_danger_prompt.cc
diff --git a/chrome/browser/download/download_danger_prompt.cc b/chrome/browser/download/download_danger_prompt.cc
index 8ed6be4ec610755ad217b9c9e95791812edea507..44219173e57b754c6c6ffd67e09b3faa2da5c1f9 100644
--- a/chrome/browser/download/download_danger_prompt.cc
+++ b/chrome/browser/download/download_danger_prompt.cc
@@ -70,8 +70,8 @@ void DownloadDangerPrompt::SendSafeBrowsingDownloadRecoveryReport(
     case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_HOST:
       report.set_download_verdict(ClientDownloadResponse::DANGEROUS_HOST);
       break;
-    default:
-      break;
+    default:  // Don't send report for any other danger types.
+      return;
   }
   report.set_url(download.GetURL().spec());
   report.set_did_proceed(did_proceed);