sync: don't allow NULL profile in ProfileSyncService and friends

chrome/browser/sync/backend_migrator_unittest.cc

Index: chrome/browser/sync/backend_migrator_unittest.cc
diff --git a/chrome/browser/sync/backend_migrator_unittest.cc b/chrome/browser/sync/backend_migrator_unittest.cc
index 205bf35a5929e44d5cb7347cfe94f48d819a977a..f261756a5b67c9d3cf8c18ad72925e6fae8ead29 100644
--- a/chrome/browser/sync/backend_migrator_unittest.cc
+++ b/chrome/browser/sync/backend_migrator_unittest.cc
@@ -29,7 +29,7 @@ using syncer::sessions::SyncSessionSnapshot;
 
 class SyncBackendMigratorTest : public testing::Test {
  public:
-  SyncBackendMigratorTest() { }
+  SyncBackendMigratorTest() : service_(&profile_) { }
   virtual ~SyncBackendMigratorTest() { }
 
   virtual void SetUp() {
@@ -104,6 +104,7 @@ class SyncBackendMigratorTest : public testing::Test {
   scoped_ptr<SyncSessionSnapshot> snap_;
   base::MessageLoop message_loop_;
   syncer::ModelTypeSet preferred_types_;
+  TestingProfile profile_;
   NiceMock<ProfileSyncServiceMock> service_;
   NiceMock<DataTypeManagerMock> manager_;
   syncer::TestUserShare test_user_share_;