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.cc

Index: chrome/browser/task_manager/task_manager_browsertest_util.cc
diff --git a/chrome/browser/task_manager/task_manager_browsertest_util.cc b/chrome/browser/task_manager/task_manager_browsertest_util.cc
index 4addcb0a518187f449e95b0874de132c27f804cb..a003f0f5dde0717924f0c31660feea99d0d857f0 100644
--- a/chrome/browser/task_manager/task_manager_browsertest_util.cc
+++ b/chrome/browser/task_manager/task_manager_browsertest_util.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/task_manager/task_manager_browsertest_util.h"
 
+#include "base/command_line.h"
 #include "base/location.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
@@ -18,6 +19,7 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/task_manager/resource_provider.h"
 #include "chrome/browser/task_manager/task_manager.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/grit/generated_resources.h"
 #include "extensions/strings/grit/extensions_strings.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -177,6 +179,11 @@ class ResourceChangeObserver : public TaskManagerModelObserver {
 
 }  // namespace
 
+void EnableOldTaskManager() {
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(
+      switches::kDisableNewTaskManager);
+}
+
 void WaitForTaskManagerRows(int required_count,
                             const base::string16& title_pattern) {
   TaskManagerModel* model = TaskManager::GetInstance()->model();