Delete the old hotwording integration.

chrome/browser/media/media_stream_capture_indicator.cc

 // Copyright (c) 2012 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/media/media_stream_capture_indicator.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 39 matching lines @@
   extensions::ExtensionRegistry* registry =
       extensions::ExtensionRegistry::Get(web_contents->GetBrowserContext());
   return registry->enabled_extensions().GetExtensionOrAppByURL(
       web_contents->GetURL());
 }
 
 bool IsWhitelistedExtension(const extensions::Extension* extension) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   static const char* const kExtensionWhitelist[] = {
-    extension_misc::kHotwordExtensionId,
     extension_misc::kHotwordNewExtensionId,

[miu, 2015/03/20 04:43:50]

Out of curiosity, why is/should the hotword extension be exempt from the tab
media indicator?  My knee-jerk reaction is that there's a user privacy concern
here w.r.t. not informing the user they are being recorded.  Feel free to
discuss w/ me in a separate e-mail thread.

   };
 
   for (size_t i = 0; i < arraysize(kExtensionWhitelist); ++i) {
     if (extension->id() == kExtensionWhitelist[i])
       return true;
   }
 
   return false;
 }
 #endif  // defined(ENABLE_EXTENSIONS)
@@ skipping 395 matching lines @@
   } else if (audio && !video) {
     message_id = IDS_MEDIA_STREAM_STATUS_TRAY_TEXT_AUDIO_ONLY;
     *image = *mic_image_;
   } else if (!audio && video) {
     message_id = IDS_MEDIA_STREAM_STATUS_TRAY_TEXT_VIDEO_ONLY;
     *image = *camera_image_;
   }
 
   *tool_tip = l10n_util::GetStringUTF16(message_id);
 }