Disable caching "Chrome Hotword Shared Module" extension (temporary).

chrome/browser/extensions/updater/extension_cache_impl.h

Index: chrome/browser/extensions/updater/extension_cache_impl.h
diff --git a/chrome/browser/extensions/updater/extension_cache_impl.h b/chrome/browser/extensions/updater/extension_cache_impl.h
index b541d5dfaf16c30f9cea808e39da9a3faff5a8b2..aa229e28a98f8178580242e4d14a759328a6be76 100644
--- a/chrome/browser/extensions/updater/extension_cache_impl.h
+++ b/chrome/browser/extensions/updater/extension_cache_impl.h
@@ -52,6 +52,9 @@ class ExtensionCacheImpl : public ExtensionCache,
   // Callback that is called when local cache is ready.
   void OnCacheInitialized();
 
+  // Check if this extension is allowed to be cached.
+  bool CachingAllowed(const std::string& id);
+
   // Cache implementation that uses local cache dir.
   scoped_ptr<LocalExtensionCache> cache_;