Do not load extension system in the Profile import process.

chrome/test/base/in_process_browser_test.cc

Index: chrome/test/base/in_process_browser_test.cc
diff --git a/chrome/test/base/in_process_browser_test.cc b/chrome/test/base/in_process_browser_test.cc
index 8371e28b7e1716542465e69d14ed14a55eb1e4a0..9af9330e379d0c4698323f4f62c96674cc6c888c 100644
--- a/chrome/test/base/in_process_browser_test.cc
+++ b/chrome/test/base/in_process_browser_test.cc
@@ -37,6 +37,7 @@
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
+#include "content/public/common/content_switches.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/test_browser_thread.h"
 #include "content/public/test/test_launcher.h"
@@ -290,7 +291,7 @@ CommandLine InProcessBrowserTest::GetCommandLineForRelaunch() {
   switches.erase(switches::kUserDataDir);
   switches.erase(content::kSingleProcessTestsFlag);
   switches.erase(switches::kSingleProcess);
-  new_command_line.AppendSwitch(content::kLaunchAsBrowser);
+  new_command_line.AppendSwitch(switches::kLaunchAsBrowser);
 
 #if defined(USE_AURA)
   // Copy what UITestBase::SetLaunchSwitches() does, and also what