Turn off Task Manager should not break the build on Linux

chrome/browser/ui/browser_commands.cc

 // Copyright 2012 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.
 
 #include "chrome/browser/ui/browser_commands.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 991 matching lines @@
 
 void ToggleDevToolsWindow(Browser* browser, DevToolsToggleAction action) {
   if (action.type() == DevToolsToggleAction::kShowConsole)
     content::RecordAction(UserMetricsAction("DevTools_ToggleConsole"));
   else
     content::RecordAction(UserMetricsAction("DevTools_ToggleWindow"));
   DevToolsWindow::ToggleDevToolsWindow(browser, action);
 }
 
 bool CanOpenTaskManager() {
+#if defined(ENABLE_TASK_MANAGER)
 #if defined(OS_WIN)
   // In metro we can't display the task manager, as it is a native window.
   return !win8::IsSingleWindowMetroMode();
 #else
   return true;
 #endif
+#else
+  return false;
+#endif
 }
 
 void OpenTaskManager(Browser* browser) {
+#if defined(ENABLE_TASK_MANAGER)
   content::RecordAction(UserMetricsAction("TaskManager"));
   chrome::ShowTaskManager(browser);
+#else
+  NOTREACHED();
+#endif
 }
 
 void OpenFeedbackDialog(Browser* browser) {
   content::RecordAction(UserMetricsAction("Feedback"));
   chrome::ShowFeedbackPage(browser, std::string(), std::string());
 }
 
 void ToggleBookmarkBar(Browser* browser) {
   content::RecordAction(UserMetricsAction("ShowBookmarksBar"));
   ToggleBookmarkBarWhenVisible(browser->profile());
@@ skipping 211 matching lines @@
           Browser::TYPE_POPUP, app_name, gfx::Rect(), browser->profile(),
           browser->host_desktop_type()));
   app_browser->tab_strip_model()->AppendWebContents(contents, true);
 
   contents->GetMutableRendererPrefs()->can_accept_load_drops = false;
   contents->GetRenderViewHost()->SyncRendererPrefs();
   app_browser->window()->Show();
 }
 
 }  // namespace chrome