Only enable Hotwords when extensions are enabled.

chrome/browser/extensions/component_loader.cc

Index: chrome/browser/extensions/component_loader.cc
diff --git a/chrome/browser/extensions/component_loader.cc b/chrome/browser/extensions/component_loader.cc
index 028fc155018a25154e31ead283aa937d8d206ea9..20d08009a2e3cbf2ce88a64753f6a7e87242f462 100644
--- a/chrome/browser/extensions/component_loader.cc
+++ b/chrome/browser/extensions/component_loader.cc
@@ -12,7 +12,6 @@
 #include "base/metrics/field_trial.h"
 #include "base/path_service.h"
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/search/hotword_service_factory.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_version_info.h"
@@ -52,6 +51,10 @@
 #include "grit/chromium_strings.h"
 #endif
 
+#if defined(ENABLE_EXTENSIONS)
+#include "chrome/browser/search/hotword_service_factory.h"
+#endif
+
 using content::BrowserThread;
 
 namespace extensions {
@@ -302,10 +305,12 @@ void ComponentLoader::AddHangoutServicesExtension() {
 }
 
 void ComponentLoader::AddHotwordHelperExtension() {
+#if defined(ENABLE_EXTENSIONS)
   if (HotwordServiceFactory::IsHotwordAllowed(browser_context_)) {
     Add(IDR_HOTWORD_HELPER_MANIFEST,
         base::FilePath(FILE_PATH_LITERAL("hotword_helper")));
   }
+#endif
 }
 
 void ComponentLoader::AddImageLoaderExtension() {