Turn off Task Manager should not break the build on Linux

chrome/browser/ui/browser_commands.cc

Index: chrome/browser/ui/browser_commands.cc
diff --git a/chrome/browser/ui/browser_commands.cc b/chrome/browser/ui/browser_commands.cc
index de82e31324840c45892150c346eb4fc338e64f30..580f21f6141cf5460c1df9ef54a3db77985346a5 100644
--- a/chrome/browser/ui/browser_commands.cc
+++ b/chrome/browser/ui/browser_commands.cc
@@ -1009,17 +1009,25 @@ void ToggleDevToolsWindow(Browser* browser, DevToolsToggleAction 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) {