Change the new-task-manager flag so that the new implementation is enabled by default for all users.

chrome/browser/task_manager/task_manager_browsertest_util.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_BROWSERTEST_UTIL_H_
 #define CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_BROWSERTEST_UTIL_H_
 
 #include "base/strings/string16.h"
 
 namespace task_manager {
 namespace browsertest_util {
 
+// For the old task manager browser tests, they must call this to disable the
+// use of the old implementation and revert back to the old one.

[Lei Zhang, 2015/08/14 22:44:24]

the first "old" is suppose to be new, right?

[afakhry, 2015/08/14 23:04:40]

Actually it's the second "old". Done.

[Lei Zhang, 2015/08/14 23:22:58]

Eh? Surely you also meant the first one since that's the one you changed. :-P

[afakhry, 2015/08/14 23:25:51]

There used to be three "old"s in the comment! :D I guess you were talking about
the line and I was talking about the whole comment! :)

+void EnableOldTaskManager();
+
 // Runs the message loop, observing the task manager, until there are exactly
 // |resource_count| many resources whose titles match the pattern
 // |title_pattern|. The match is done via string_util's base::MatchPattern, so
 // |title_pattern| may contain wildcards like "*".
 //
 // If the wait times out, this test will trigger a gtest failure. To get
 // meaningful errors, tests should wrap invocations of this function with
 // ASSERT_NO_FATAL_FAILURE().
 void WaitForTaskManagerRows(int resource_count,
                             const base::string16& title_pattern);
@@ skipping 36 matching lines @@
 base::string16 MatchSubframe(const char* title);    // "Subframe: " + title
 base::string16 MatchAnySubframe();                  // "Subframe: *"
 // "Utility: " + title
 base::string16 MatchUtility(const base::string16& title);
 base::string16 MatchAnyUtility();                   // "Utility: *"
 
 }  // namespace browsertest_util
 }  // namespace task_manager
 
 #endif  // CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_BROWSERTEST_UTIL_H_