Revert "Disable flaky TaskManagerBrowserTest.NoticeHostedAppTabAfterReload on Linux"

This reverts commit 1205b351.

Reason for revert: Accidentally disabled the wrong test. The flaky test seems ok again, so just reverting this CL.

Original change's description:
> Disable flaky TaskManagerBrowserTest.NoticeHostedAppTabAfterReload on Linux
> 
> Tbr: afakhry@chromium.org
> Bug: 1017110
> Change-Id: I3c153b07a4d6c381b7c85684d0e59f09b71712b9
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875259
> Reviewed-by: Christian Dullweber <dullweber@chromium.org>
> Commit-Queue: Christian Dullweber <dullweber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#708555}

TBR=afakhry@chromium.org,dullweber@chromium.org

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

Bug: 1017110
Change-Id: Ieda5cfa39e22dd0b965e27d08db6d4962baedde6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1892771Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711189}

chrome/browser/task_manager/task_manager_browsertest.cc

@@ -462,14 +462,7 @@ IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, NoticeAppTab) {
   ASSERT_TRUE(model()->GetTabId(app_tab).is_valid());
 }
 
-#if defined(OS_LINUX)
-// Flaky on Linux https://crbug.com/1017110
-#define MAYBE_NoticeHostedAppTabChanges DISABLED_NoticeHostedAppTabChanges
-#else
-#define MAYBE_NoticeHostedAppTabChanges NoticeHostedAppTabChanges
-#endif
-IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest,
-                       MAYBE_NoticeHostedAppTabChanges) {
+IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, NoticeHostedAppTabChanges) {
   ShowTaskManager();
 
   // The app under test acts on URLs whose host is "localhost",