Replace "external_install" boolean parameter with explicit enumeration in ExtensionUninstall method.

chrome/browser/search/hotword_service.cc

Index: chrome/browser/search/hotword_service.cc
diff --git a/chrome/browser/search/hotword_service.cc b/chrome/browser/search/hotword_service.cc
index f7f8aeddb8ebf2d4bf0b360ea86f9d669160dc1f..f395fd9d15584130a0db51e7aab44e57de5cdc70 100644
--- a/chrome/browser/search/hotword_service.cc
+++ b/chrome/browser/search/hotword_service.cc
@@ -360,7 +360,9 @@ bool HotwordService::UninstallHotwordExtension(
     ExtensionService* extension_service) {
   base::string16 error;
   if (!extension_service->UninstallExtension(
-          extension_misc::kHotwordExtensionId, true, &error)) {
+          extension_misc::kHotwordExtensionId,
+          ExtensionService::UNINSTALL_REASON_INTERNAL_MANAGEMENT,
+          &error)) {
     LOG(WARNING) << "Cannot uninstall extension with id "
                  << extension_misc::kHotwordExtensionId
                  << ": " << error;