Disable flaky TaskManagerBrowserTest.NoticeHostedAppTab*Reload on Linux.

TBR=afakhry@chromium.org

Bug: 1021553
Change-Id: I6d6170beb77d08da192d24e7ebb7246a83926a7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899334Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712622}

chrome/browser/task_manager/task_manager_browsertest.cc

@@ -516,7 +516,15 @@ IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, NoticeHostedAppTabChanges) {
   ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(0, MatchAnyApp()));
 }
 
-IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, NoticeHostedAppTabAfterReload) {
+// Flaky - crbug.com/102553
+#if defined(OS_LINUX)
+#define MAYBE_NoticeHostedAppTabAfterReload \
+  DISABLED_NoticeHostedAppTabAfterReload
+#else
+#define MAYBE_NoticeHostedAppTabAfterReload NoticeHostedAppTabAfterReload
+#endif
+IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest,
+                       MAYBE_NoticeHostedAppTabAfterReload) {
   // The app under test acts on URLs whose host is "localhost",
   // so the URLs we navigate to must have host "localhost".
   GURL base_url = embedded_test_server()->GetURL(
@@ -546,7 +554,15 @@ IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, NoticeHostedAppTabAfterReload) {
   ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(0, MatchAnyExtension()));
 }
 
-IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, NoticeHostedAppTabBeforeReload) {
+// Flaky - crbug.com/102553
+#if defined(OS_LINUX)
+#define MAYBE_NoticeHostedAppTabBeforeReload \
+  DISABLED_NoticeHostedAppTabBeforeReload
+#else
+#define MAYBE_NoticeHostedAppTabBeforeReload NoticeHostedAppTabBeforeReload
+#endif
+IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest,
+                       MAYBE_NoticeHostedAppTabBeforeReload) {
   // The app under test acts on URLs whose host is "localhost",
   // so the URLs we navigate to must have host "localhost".
   GURL base_url = embedded_test_server()->GetURL(