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

chrome/browser/extensions/component_extensions_whitelist/whitelist.cc

Index: chrome/browser/extensions/component_extensions_whitelist/whitelist.cc
diff --git a/chrome/browser/extensions/component_extensions_whitelist/whitelist.cc b/chrome/browser/extensions/component_extensions_whitelist/whitelist.cc
index 2c2c3f2d1b0346275bb5dd5fa7ca725c6945ea69..1e0e87aab1da47e533fc9fce48dd6ac455a87c10 100644
--- a/chrome/browser/extensions/component_extensions_whitelist/whitelist.cc
+++ b/chrome/browser/extensions/component_extensions_whitelist/whitelist.cc
@@ -32,6 +32,7 @@ bool IsComponentExtensionWhitelisted(const std::string& extension_id) {
     extension_misc::kPdfExtensionId,
 #if defined(OS_CHROMEOS)
     extension_misc::kChromeVoxExtensionId,
+    extension_misc::kSpeechSynthesisExtensionId,
     extension_misc::kZIPUnpackerExtensionId,
 #endif
   };
@@ -107,8 +108,6 @@ bool IsComponentExtensionWhitelisted(int manifest_resource_id) {
     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