Delete the old hotwording integration.

chrome/browser/search/hotword_service.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_H_
 #define CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 42 matching lines @@
                                                false,
                                                callback) {}
     void Shutdown();
    protected:
     ~HotwordWebstoreInstaller() override {}
   };
 
   // Returns true if the hotword supports the current system language.
   static bool DoesHotwordSupportLanguage(Profile* profile);
 
-  // Always returns true.
-  // TODO(amistry): Remove this.
-  static bool IsExperimentalHotwordingEnabled();
-
   // Returns true if hotwording hardware is available.
   static bool IsHotwordHardwareAvailable();
 
   explicit HotwordService(Profile* profile);
   ~HotwordService() override;
 
   // Overridden from ExtensionRegisterObserver:
   void OnExtensionInstalled(content::BrowserContext* browser_context,
                             const extensions::Extension* extension,
                             bool is_update) override;
@@ skipping 15 matching lines @@
   // Checks if the user has opted into audio logging. Returns true if the user
   // is opted in, false otherwise..
   bool IsOptedIntoAudioLogging();
 
   // Returns whether always-on hotwording is enabled.
   bool IsAlwaysOnEnabled();
 
   // Returns whether google.com/NTP/launcher hotwording is enabled.
   bool IsSometimesOnEnabled();
 
-  // Control the state of the hotword extension.
-  void EnableHotwordExtension(ExtensionService* extension_service);
-  void DisableHotwordExtension(ExtensionService* extension_service);
-
-  // Handles enabling/disabling the hotword extension when the user
-  // turns it off via the settings menu.
-  void OnHotwordSearchEnabledChanged(const std::string& pref_name);
-
   // Handles enabling/disabling the hotword notification when the user
   // changes the always on search settings.
   void OnHotwordAlwaysOnSearchEnabledChanged(const std::string& pref_name);
 
   // Called to handle the hotword session from |client|.
   void RequestHotwordSession(HotwordClient* client);
   void StopHotwordSession(HotwordClient* client);
   HotwordClient* client() { return client_; }
 
   // Checks if the current version of the hotword extension should be
@@ skipping 111 matching lines @@
 
   // The WeakPtrFactory should be the last member, so the weak pointer
   // gets invalidated before the destructors for other members run,
   // to avoid callbacks into a half-destroyed object.
   base::WeakPtrFactory<HotwordService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HotwordService);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_H_