[Hotword] Reverse the experimental flag so that it is on by default.

chrome/browser/ui/app_list/speech_recognizer_browsertest.cc

Index: chrome/browser/ui/app_list/speech_recognizer_browsertest.cc
diff --git a/chrome/browser/ui/app_list/speech_recognizer_browsertest.cc b/chrome/browser/ui/app_list/speech_recognizer_browsertest.cc
index 3ebfe23448b866c5aed2a95a25f395cfe2944ebf..5e31309212d1ccfc42426eca6f0d357e85d6ef48 100644
--- a/chrome/browser/ui/app_list/speech_recognizer_browsertest.cc
+++ b/chrome/browser/ui/app_list/speech_recognizer_browsertest.cc
@@ -59,10 +59,6 @@ class AppListSpeechRecognizerBrowserTest : public InProcessBrowserTest {
         browser()->profile(), NULL));
   }
 
-  void SetUpCommandLine(base::CommandLine* command_line) override {
-    command_line->AppendSwitch(switches::kEnableExperimentalHotwording);
-  }
-
   void TearDownOnMainThread() override {
     // This puts stuff on the IO loop which needs to be executed.
     test_contents_.reset();