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

chrome/browser/extensions/extension_gcm_app_handler_unittest.cc

Index: chrome/browser/extensions/extension_gcm_app_handler_unittest.cc
diff --git a/chrome/browser/extensions/extension_gcm_app_handler_unittest.cc b/chrome/browser/extensions/extension_gcm_app_handler_unittest.cc
index 6b5726191be778baeedb8a85aed76a937082faef..2198ed1e0c61b0528e6d41896be10603e1235e0e 100644
--- a/chrome/browser/extensions/extension_gcm_app_handler_unittest.cc
+++ b/chrome/browser/extensions/extension_gcm_app_handler_unittest.cc
@@ -273,7 +273,8 @@ class ExtensionGCMAppHandlerTest : public testing::Test {
   }
 
   void UninstallExtension(const Extension* extension) {
-    extension_service_->UninstallExtension(extension->id(), false, NULL);
+    extension_service_->UninstallExtension(
+        extension->id(), ExtensionService::kUninstallReasonDefault, NULL);
   }
 
   void SignIn(const std::string& username) {