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

chrome/browser/ui/app_list/speech_recognizer_browsertest.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 "chrome/browser/ui/app_list/speech_recognizer.h"
 
 #include "base/command_line.h"
 #include "base/memory/weak_ptr.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 41 matching lines @@
     fake_speech_recognition_manager_.reset(
         new content::FakeSpeechRecognitionManager());
     fake_speech_recognition_manager_->set_should_send_fake_response(true);
     content::SpeechRecognitionManager::SetManagerForTesting(
         fake_speech_recognition_manager_.get());
     mock_speech_delegate_.reset(new MockSpeechRecognizerDelegate());
     test_contents_.reset(content::WebContentsTester::CreateTestWebContents(
         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();
 
     // Poor-person's way of ensuring IO loop is idle.
     auto io_loop = content::BrowserThread::UnsafeGetMessageLoopForThread(
         content::BrowserThread::IO);
     ASSERT_TRUE(io_loop);
     while (!io_loop->IsIdleForTesting()) {
       // Sleep for a little bit, allowing the IO thread to obtain any locks
@@ skipping 26 matching lines @@
   EXPECT_CALL(*mock_speech_delegate_,
               OnSpeechRecognitionStateChanged(SPEECH_RECOGNITION_READY))
       .WillOnce(InvokeWithoutArgs(&run_loop, &base::RunLoop::Quit));
   recognizer.Start();
   run_loop.Run();
 }
 
 }  // namespace app_list