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

chrome/common/extensions/extension_constants.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/common/extensions/extension_constants.h"
 
 namespace extension_urls {
 
 namespace {
 
@@ skipping 41 matching lines @@
 const char kInAppPaymentsSupportAppId[] = "nmmhkkegccagdldgiimedpiccmgmieda";
 #if defined(ENABLE_MEDIA_ROUTER)
 const char kMediaRouterStableExtensionId[] = "fjhoaacokmgbjemoflkofnenfaiekifl";
 #endif  // defined(ENABLE_MEDIA_ROUTER)
 
 #if defined(OS_CHROMEOS)
 // The extension id for the built-in component extension.
 const char kChromeVoxExtensionId[] =
     "mndnfokpggljbaajbnioimlmbfngpief";
 const char kChromeVoxExtensionPath[] = "chromeos/chromevox";
-const char kChromeVoxManifestFilename[] = "manifest.json";
-const char kChromeVoxGuestManifestFilename[] = "manifest_guest.json";
+const base::FilePath::CharType kGuestManifestFilename[] =
+    FILE_PATH_LITERAL("manifest_guest.json");
 const char kBrailleImeExtensionId[] =
     "jddehjeebkoimngcbdkaahpobgicbffp";
 const char kBrailleImeExtensionPath[] =
     "chromeos/braille_ime";
 const char kBrailleImeEngineId[] =
     "_comp_ime_jddehjeebkoimngcbdkaahpobgicbffpbraille";
 const char kConnectivityDiagnosticsPath[] =
     "/usr/share/chromeos-assets/connectivity_diagnostics";
 const char kConnectivityDiagnosticsLauncherPath[] =
     "/usr/share/chromeos-assets/connectivity_diagnostics_launcher";
@@ skipping 44 matching lines @@
     0xfc, 0xf3, 0x08, 0x12, 0xff, 0x93, 0xbd, 0x62, 0x31, 0xd8, 0x1c, 0xea,
     0x1a, 0x9e, 0xf5, 0x81, 0x28, 0x7f, 0x75, 0x5e, 0xd2, 0x27, 0x7a, 0xc2,
     0x96, 0xf5, 0x9d, 0xdb, 0x18, 0xfc, 0x76, 0xdc, 0x46, 0xf0, 0x57, 0xc0,
     0x58, 0x34, 0xc8, 0x22, 0x2d, 0x2a, 0x65, 0x75, 0xa7, 0xd9, 0x08, 0x62,
     0xcd, 0x02, 0x03, 0x01, 0x00, 0x01};
 
 const int kWebstoreSignaturesPublicKeySize =
     arraysize(kWebstoreSignaturesPublicKey);
 
 }  // namespace extension_misc