Revert "Disable DeleteActiveSession on Win"

This reverts commit 0b61ff47.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Disable DeleteActiveSession on Win
> 
> TBR=thestig@chromium.org
> NOTRY=true
> 
> Bug: 836289
> Change-Id: I669edb4d3ec8af8e144e5fac812ed0b1422e5e55
> Reviewed-on: https://chromium-review.googlesource.com/1026155
> Commit-Queue: Xida Chen <xidachen@chromium.org>
> Reviewed-by: Xida Chen <xidachen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#553165}

TBR=thestig@chromium.org,xidachen@chromium.org

Change-Id: I6b1f989a749c7cbda554d5d8b4ccee735ded64e7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 836289
Reviewed-on: https://chromium-review.googlesource.com/1026132Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553185}

chrome/browser/sync/test/integration/two_client_sessions_sync_test.cc

@@ -192,13 +192,7 @@ IN_PROC_BROWSER_TEST_P(TwoClientSessionsSyncTest, DeleteIdleSession) {
   EXPECT_FALSE(GetSessionData(1, &sessions1));
 }
 
-// Timeout on win (https://crbug.com/836289).
-#if deinfed(OS_WIN)
-#define MAYBE_DeleteActiveSession DISABLED_DeleteActiveSession
-#else
-#define MAYBE_DeleteActiveSession DeleteActiveSession
-#endif
-IN_PROC_BROWSER_TEST_P(TwoClientSessionsSyncTest, MAYBE_DeleteActiveSession) {
+IN_PROC_BROWSER_TEST_P(TwoClientSessionsSyncTest, DeleteActiveSession) {
   ASSERT_TRUE(SetupSync()) << "SetupSync() failed.";
 
   ASSERT_TRUE(CheckInitialState(0));