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

chrome/browser/apps/ephemeral_app_browsertest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "apps/saved_files_service.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/stl_util.h"
 #include "chrome/browser/apps/app_browsertest_util.h"
 #include "chrome/browser/apps/ephemeral_app_service.h"
 #include "chrome/browser/extensions/api/file_system/file_system_api.h"
@@ skipping 145 matching lines @@
   void EvictApp(const std::string& app_id) {
     // Uninstall the app, which is what happens when ephemeral apps get evicted
     // from the cache.
     content::WindowedNotificationObserver uninstalled_signal(
         chrome::NOTIFICATION_EXTENSION_UNINSTALLED,
         content::Source<Profile>(browser()->profile()));
 
     ExtensionService* service =
         ExtensionSystem::Get(browser()->profile())->extension_service();
     ASSERT_TRUE(service);
-    service->UninstallExtension(app_id, false, NULL);
+    service->UninstallExtension(
+        app_id,
+        ExtensionService::kUninstallReasonOrphanedEphemeralExtension,
+        NULL);
 
     uninstalled_signal.Wait();
   }
 
   void VerifyAppNotLoaded(const std::string& app_id) {
     EXPECT_FALSE(ExtensionSystem::Get(browser()->profile())->
         process_manager()->GetBackgroundHostForExtension(app_id));
   }
 
   void DispatchAlarmEvent(EventRouter* event_router,
@@ skipping 325 matching lines @@
 
   // The garbage collected app should no longer be in the preferences.
   extensions_info = prefs->GetEvictedEphemeralAppsInfo();
   EXPECT_TRUE(IsAppInExtensionsInfo(*extensions_info, retain_app_id));
   ASSERT_FALSE(IsAppInExtensionsInfo(*extensions_info, evict_app_id));
 
   // Reinstall the app and verify that all data has been reset.
   evict_app = InstallEphemeralApp(kRetainDataApp);
   ASSERT_TRUE(LaunchAppAndRunTest(evict_app, "DataReset")) << message_;
 }