Disable new hotwording in the launcher for non-ChromeOS.

chrome/browser/ui/app_list/start_page_service.cc

Index: chrome/browser/ui/app_list/start_page_service.cc
diff --git a/chrome/browser/ui/app_list/start_page_service.cc b/chrome/browser/ui/app_list/start_page_service.cc
index 09c66ca0cf5e9bd799579033518de37491075e47..562030e32819e7fb6f4689ba6aeda52b45ee20ea 100644
--- a/chrome/browser/ui/app_list/start_page_service.cc
+++ b/chrome/browser/ui/app_list/start_page_service.cc
@@ -202,13 +202,15 @@ void StartPageService::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