Load the Chrome OS TTS engine manifest from the file system isntead of resources.

chrome/browser/extensions/component_extensions_whitelist/whitelist.cc

 // Copyright 2015 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/extensions/component_extensions_whitelist/whitelist.h"
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "chrome/browser/bookmarks/enhanced_bookmarks_features.h"
 #include "chrome/common/extensions/extension_constants.h"
@@ skipping 14 matching lines @@
 namespace extensions {
 
 bool IsComponentExtensionWhitelisted(const std::string& extension_id) {
   const char* allowed[] = {
     extension_misc::kHotwordSharedModuleId,
     extension_misc::kInAppPaymentsSupportAppId,
     extension_misc::kMediaRouterStableExtensionId,
     extension_misc::kPdfExtensionId,
 #if defined(OS_CHROMEOS)
     extension_misc::kChromeVoxExtensionId,
+    extension_misc::kSpeechSynthesisExtensionId,
     extension_misc::kZIPUnpackerExtensionId,
 #endif
   };
 
   for (size_t i = 0; i < arraysize(allowed); ++i) {
     if (extension_id == allowed[i])
       return true;
   }
 
   std::string bookmark_extension_id;
@@ skipping 55 matching lines @@
     IDR_FILEMANAGER_MANIFEST,
     IDR_FIRST_RUN_DIALOG_MANIFEST,
     IDR_GAIA_AUTH_KEYBOARD_MANIFEST,
     IDR_GALLERY_MANIFEST,
     IDR_GENIUS_APP_MANIFEST,
     IDR_HELP_MANIFEST,
     IDR_KEYBOARD_MANIFEST,
     IDR_MOBILE_MANIFEST,
     IDR_NETWORK_CONFIGURATION_MANIFEST,
     IDR_QUICKOFFICE_MANIFEST,
-    IDR_SPEECH_SYNTHESIS_GUEST_MANIFEST,
-    IDR_SPEECH_SYNTHESIS_MANIFEST,
     IDR_VIDEO_PLAYER_MANIFEST,
     IDR_WALLPAPERMANAGER_MANIFEST,
 #endif
   };
 
   for (size_t i = 0; i < arraysize(allowed); ++i) {
     if (manifest_resource_id == allowed[i])
       return true;
   }
 
   LOG(ERROR) << "Component extension with manifest resource id "
              << manifest_resource_id << " not in whitelist and is not being "
              << "loaded as a result.";
   NOTREACHED();
   return false;
 }
 
 }  // namespace extensions