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

Index: chrome/browser/task_manager/task_manager_browsertest_util.h
diff --git a/chrome/browser/task_manager/task_manager_browsertest_util.h b/chrome/browser/task_manager/task_manager_browsertest_util.h
index 334fa268596dc801bc2cc7b5c8de67f8a4a97e12..2050932eb300a7c505d7785bf074a1101ddb8b69 100644
--- a/chrome/browser/task_manager/task_manager_browsertest_util.h
+++ b/chrome/browser/task_manager/task_manager_browsertest_util.h
@@ -10,6 +10,10 @@
 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