Make old task manager tests work against new task manager.

chrome/browser/ui/webui/print_preview/print_preview_ui_browsertest.cc

Index: chrome/browser/ui/webui/print_preview/print_preview_ui_browsertest.cc
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_ui_browsertest.cc b/chrome/browser/ui/webui/print_preview/print_preview_ui_browsertest.cc
index 6e3b6934a25d7f8887634d48ed47c6af50c17e3b..a7006b880fa4f6ae6e002b3ffe78707e1d37cd40 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_ui_browsertest.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_ui_browsertest.cc
@@ -91,10 +91,6 @@ IN_PROC_BROWSER_TEST_F(PrintPreviewTest, PrintCommands) {
 #define MAYBE_TaskManagerNewPrintPreview TaskManagerNewPrintPreview
 #endif
 IN_PROC_BROWSER_TEST_F(PrintPreviewTest, MAYBE_TaskManagerNewPrintPreview) {
-  // This test is for the old implementation of the task manager. We must
-  // explicitly disable the new one.
-  task_manager::browsertest_util::EnableOldTaskManager();
-
   chrome::ShowTaskManager(browser());  // Show task manager BEFORE print dialog.
 
   ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(1, MatchAboutBlankTab()));
@@ -114,10 +110,6 @@ IN_PROC_BROWSER_TEST_F(PrintPreviewTest, MAYBE_TaskManagerNewPrintPreview) {
 // http://crbug/367665.
 IN_PROC_BROWSER_TEST_F(PrintPreviewTest,
                        DISABLED_TaskManagerExistingPrintPreview) {

[afakhry, 2016/04/28 00:03:13]

Have you tried re-enabling these tests? Maybe they pass now?

[ncarter (slow), 2016/05/02 18:33:28]

These tests have been historically pretty flaky. I'd want to really dig into
them before reenabling.

I actually think the tags-based tests you've added for printing are better tests
overall. Maybe the thing to do here is to merge these into those.

-  // This test is for the old implementation of the task manager. We must
-  // explicitly disable the new one.
-  task_manager::browsertest_util::EnableOldTaskManager();
-
   // Create the print preview dialog.
   Print();