Wire up download attribution enable finch experiment

chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc

Index: chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc
diff --git a/chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc b/chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc
index 7450d8182b41ec86accad557fce2ea32b2975d5f..0e4c257f67a5d036f56d4c4f81b0711ccfc24753 100644
--- a/chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc
+++ b/chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc
@@ -561,16 +561,10 @@ IN_PROC_BROWSER_TEST_F(SBNavigationObserverBrowserTest,
                            referrer_chain[2]);
 }
 
-// https://crbug.com/667784: The test is flaky on Linux.
-#if defined(OS_LINUX)
-#define MAYBE_SingleMetaRefreshRedirectTargetBlank DISABLED_SingleMetaRefreshRedirectTargetBlank
-#else
-#define MAYBE_SingleMetaRefreshRedirectTargetBlank SingleMetaRefreshRedirectTargetBlank
-#endif
 // Click on a link which navigates to a page then redirects to a download using
 // META HTTP-EQUIV="refresh". First navigation happens in target blank.
 IN_PROC_BROWSER_TEST_F(SBNavigationObserverBrowserTest,
-                       MAYBE_SingleMetaRefreshRedirectTargetBlank) {
+                       SingleMetaRefreshRedirectTargetBlank) {
   GURL initial_url = embedded_test_server()->GetURL(kSingleFrameTestURL);
   ClickTestLink("single_meta_refresh_redirect_target_blank", 2, initial_url);
   GURL redirect_url = embedded_test_server()->GetURL(kRedirectURL);