Do not load extension system in the Profile import process.

chrome/browser/extensions/extension_system.cc

Index: chrome/browser/extensions/extension_system.cc
diff --git a/chrome/browser/extensions/extension_system.cc b/chrome/browser/extensions/extension_system.cc
index 1a6cda5fce809b66eb6f4b05312abdc62b95cb7d..8aaf8783e7aa9f37a00e3b0b85b2227bf4838447 100644
--- a/chrome/browser/extensions/extension_system.cc
+++ b/chrome/browser/extensions/extension_system.cc
@@ -202,17 +202,14 @@ void ExtensionSystemImpl::Shared::Init(bool extensions_enabled) {
   // initialized (see issue 40144). Now that bookmarks aren't imported and
   // the event routers need to be initialized for every profile individually,
   // initialize them with the extension service.
-  // If this profile is being created as part of the import process, never
-  // initialize the event routers. If import is going to run in a separate
-  // process (the profile itself is on the main process), wait for import to
-  // finish before initializing the routers.
-  if (!command_line->HasSwitch(switches::kImport) &&
-      !command_line->HasSwitch(switches::kImportFromFile)) {
-    if (g_browser_process->profile_manager()->will_import()) {
-      extension_service_->InitEventRoutersAfterImport();
-    } else {
-      extension_service_->InitEventRouters();
-    }
+  // If import is going to run in a separate process (the profile itself is on
+  // the main process), wait for import to finish before initializing the
+  // routers.
+  CHECK(!ProfileManager::IsImportProcess(*command_line));
+  if (g_browser_process->profile_manager()->will_import()) {
+    extension_service_->InitEventRoutersAfterImport();
+  } else {
+    extension_service_->InitEventRouters();
   }
 
   extension_warning_service_.reset(new ExtensionWarningService(profile_));