Disable ProfileKeyedServices on import process by default.

chrome/browser/profiles/profile_keyed_base_factory.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_KEYED_BASE_FACTORY_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_KEYED_BASE_FACTORY_H_
 
 #include <set>
 
 #include "base/threading/non_thread_safe.h"
@@ skipping 54 matching lines @@
   // created as soon as the Profile has been brought up.
   virtual bool ServiceIsCreatedWithProfile() const;
 
   // By default, TestingProfiles will be treated like normal profiles. You can
   // override this so that by default, the service associated with the
   // TestingProfile is NULL. (This is just a shortcut around
   // SetTestingFactory() to make sure our profiles don't directly refer to the
   // services they use.)
   virtual bool ServiceIsNULLWhileTesting() const;
 
+  // By default, we do not create any services on the import process. Any
+  // services that are required to perform an import should override this method
+  // and return |false|. Note that any services created on the import process
+  // may run in parallel with another instance of the service running in the
+  // main browser process, so care must be taken to avoid conflicting use of
+  // non-shareable resources like DB files.
+  virtual bool ServiceIsNULLOnImportProcess() const;
+
   // Interface for people building a type of ProfileKeyedFactory: -------------
 
   // A helper object actually listens for notifications about Profile
   // destruction, calculates the order in which things are destroyed and then
   // does a two pass shutdown.
   //
   // It is up to the individual factory types to determine what this two pass
   // shutdown means. The general framework guarantees the following:
   //
   // - Each ProfileShutdown() is called in dependency order (and you may reach
@@ skipping 38 matching lines @@
 
 #if !defined(NDEBUG)
   // A static string passed in to our constructor. Should be unique across all
   // services. This is used only for debugging in debug mode. (We can print
   // pretty graphs with GraphViz with this information.)
   const char* service_name_;
 #endif
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_KEYED_BASE_FACTORY_H_