Revert "[sheriff] Disable SiteDataCountingHelperTest.SameHostDifferentScheme"

This reverts commit 8e10fb2a.

Reason for revert: Reenable the test to check if failure still exists

Original change's description:
> [sheriff] Disable SiteDataCountingHelperTest.SameHostDifferentScheme
>
> TBR=eirage@chromium.org
> NOTRY=true
>
> Bug: 1168198
> Change-Id: I3196ad66bace95157d110f840babd269d394df32
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2637963
> Reviewed-by: Xida Chen <xidachen@chromium.org>
> Reviewed-by: Ella Ge <eirage@chromium.org>
> Commit-Queue: Xida Chen <xidachen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#844891}

TBR=xidachen@chromium.org,eirage@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

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

Bug: 1168198
Change-Id: I67f5a97d8e82513e13025c37639ea3fdeede022b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2642630Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846090}

chrome/browser/browsing_data/counters/site_data_counting_helper_unittest.cc

@@ -160,8 +160,7 @@ TEST_F(SiteDataCountingHelperTest, CookiesAndLocalStorage) {
   EXPECT_EQ(3, CountEntries(base::Time(), base::Time::Max()));
 }
 
-// Flaky on a few platforms: crbug.com/1168198
-TEST_F(SiteDataCountingHelperTest, DISABLED_SameHostDifferentScheme) {
+TEST_F(SiteDataCountingHelperTest, SameHostDifferentScheme) {
   base::Time now = base::Time::Now();
   CreateCookies(now, {"http://google.com", "https://google.com"});
   CreateLocalStorage(now,