Disable still-flaky test TaskManagerBrowserTest.WebWorkerJSHeapMemory.

chrome/browser/task_manager/task_manager_browsertest.cc

Index: chrome/browser/task_manager/task_manager_browsertest.cc
diff --git a/chrome/browser/task_manager/task_manager_browsertest.cc b/chrome/browser/task_manager/task_manager_browsertest.cc
index 6ec678b66dcaebfae18e6ed8eddea68281c00ef8..d923ff12104a24126ef6c64516f74b9131609e3c 100644
--- a/chrome/browser/task_manager/task_manager_browsertest.cc
+++ b/chrome/browser/task_manager/task_manager_browsertest.cc
@@ -778,7 +778,8 @@ IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest,
 
 // Checks that task manager counts a worker thread JS heap size.
 // http://crbug.com/241066
-IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, WebWorkerJSHeapMemory) {
+// Disabled because this test is inherently flaky: http://crbug.com/259368
+IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, DISABLED_WebWorkerJSHeapMemory) {
   ShowTaskManager();
   ui_test_utils::NavigateToURL(browser(), GetTestURL());
   const int extra_timeout_ms = 500;