Disable new hotwording in the launcher for non-ChromeOS.

chrome/browser/ui/app_list/start_page_service.cc

 // 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.
 
 #include "chrome/browser/ui/app_list/start_page_service.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 184 matching lines @@
 
     speech_recognizer_->Start();
     return;
   }
 
   contents_->GetWebUI()->CallJavascriptFunction(
       "appList.startPage.toggleSpeechRecognition");
 }
 
 bool StartPageService::HotwordEnabled() {
+// Voice input for the launcher is unsupported on non-ChromeOS platforms.
+// TODO(amistry): Make speech input, and hotwording, work on non-ChromeOS.
+#if defined(OS_CHROMEOS)
   if (HotwordService::IsExperimentalHotwordingEnabled()) {
     auto prefs = profile_->GetPrefs();
     return HotwordServiceFactory::IsServiceAvailable(profile_) &&
         (prefs->GetBoolean(prefs::kHotwordSearchEnabled) ||
          prefs->GetBoolean(prefs::kHotwordAlwaysOnSearchEnabled));
   }
-#if defined(OS_CHROMEOS)
   return HotwordServiceFactory::IsServiceAvailable(profile_) &&
       profile_->GetPrefs()->GetBoolean(prefs::kHotwordSearchEnabled);
 #else
   return false;
 #endif
 }
 
 content::WebContents* StartPageService::GetStartPageContents() {
   return app_list::switches::IsExperimentalAppListEnabled() ? contents_.get()
                                                             : NULL;
@@ skipping 92 matching lines @@
       ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
       std::string());
 }
 
 void StartPageService::UnloadContents() {
   contents_.reset();
   webui_finished_loading_ = false;
 }
 
 }  // namespace app_list