Revert "Disable flaky SubframeNavigationFilteringThrottleTest.FilterOnRedirect"

This reverts commit dde9b262.

Reason for revert: The test is not the root cause, see crbug.com/1011275

Original change's description:
> Disable flaky SubframeNavigationFilteringThrottleTest.FilterOnRedirect
> 
> TBR=battre@chromium.org
> 
> Bug: 1010781
> Change-Id: Iba7c19d5c4cf12160128ac15e91d9042d0cd7bd4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837439
> Reviewed-by: Yoichi Osato <yoichio@chromium.org>
> Commit-Queue: Yoichi Osato <yoichio@chromium.org>
> Auto-Submit: Yoichi Osato <yoichio@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#702325}

TBR=battre@chromium.org,yoichio@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1010781
Change-Id: I40f87c3c316a07944c6fae169a1113465bd26fb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1840232Reviewed-by: Dominic Battré <battre@chromium.org>
Commit-Queue: Dominic Battré <battre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702790}

components/subresource_filter/content/browser/subframe_navigation_filtering_throttle_unittest.cc

@@ -164,7 +164,12 @@ TEST_F(SubframeNavigationFilteringThrottleTest, FilterOnStart) {
       base::Contains(GetConsoleMessages(), GetFilterConsoleMessage(url)));
 }
 
-TEST_F(SubframeNavigationFilteringThrottleTest, DISABLED_FilterOnRedirect) {
+#if defined(OS_MACOSX)
+#define MAYBE_FilterOnRedirect DISABLED_FilterOnRedirect
+#else
+#define MAYBE_FilterOnRedirect FilterOnRedirect
+#endif
+TEST_F(SubframeNavigationFilteringThrottleTest, MAYBE_FilterOnRedirect) {
   InitializeDocumentSubresourceFilter(GURL("https://example.test"));
   CreateTestSubframeAndInitNavigation(GURL("https://example.test/allowed.html"),
                                       main_rfh());