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

chrome/browser/extensions/api/hotword_private/hotword_private_apitest.cc

 // Copyright 2014 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 "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/extensions/api/hotword_private/hotword_private_api.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/history/web_history_service.h"
@@ skipping 252 matching lines @@
   {
     ExtensionTestMessageListener listener("alwaysOnEnabled: true",
                                           false);
     ASSERT_TRUE(RunComponentExtensionTest("alwaysOnEnabled"))
         << message_;
     EXPECT_TRUE(listener.WaitUntilSatisfied());
   }
 }
 
 IN_PROC_BROWSER_TEST_F(HotwordPrivateApiTest, ExperimentalHotwordEnabled) {
-  // Disabled by default.
-  ExtensionTestMessageListener listener("experimentalHotwordEnabled: false",
+  // Enabled by default.
+  ExtensionTestMessageListener listener("experimentalHotwordEnabled: true",
                                         false);
   ASSERT_TRUE(RunComponentExtensionTest("experimentalHotwordEnabled"))
       << message_;
   EXPECT_TRUE(listener.WaitUntilSatisfied());
 }
 
 IN_PROC_BROWSER_TEST_F(HotwordPrivateApiTest,
                        ExperimentalHotwordEnabled_Enabled) {
-  base::CommandLine::ForCurrentProcess()->AppendSwitch(
-      switches::kEnableExperimentalHotwording);
   ExtensionTestMessageListener listener("experimentalHotwordEnabled: true",
                                         false);
   ASSERT_TRUE(RunComponentExtensionTest("experimentalHotwordEnabled"))
       << message_;
   EXPECT_TRUE(listener.WaitUntilSatisfied());
 }
 
 IN_PROC_BROWSER_TEST_F(HotwordPrivateApiTest, OnEnabledChanged) {
   // Trigger the pref registrar.
   extensions::HotwordPrivateEventService::GetFactoryInstance();
@@ skipping 173 matching lines @@
   ExtensionTestMessageListener setListenerT("set AH: false failure", false);
   ExtensionTestMessageListener setListenerF("set AH: false failure", false);
   ExtensionTestMessageListener getListener("get AH: false failure", false);
 
   ASSERT_TRUE(RunComponentExtensionTest("audioHistory")) << message_;
 
   EXPECT_TRUE(setListenerT.WaitUntilSatisfied());
   EXPECT_TRUE(setListenerF.WaitUntilSatisfied());
   EXPECT_TRUE(getListener.WaitUntilSatisfied());
 }