sync_backend_host_impl_unittest.cc: Remove dead code.

components/sync/driver/glue/sync_backend_host_impl_unittest.cc

 // Copyright 2013 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 "components/sync/driver/glue/sync_backend_host_impl.h"
 
 #include <cstddef>
 #include <utility>
 
 #include "base/files/file_util.h"
@@ skipping 41 matching lines @@
 using ::testing::StrictMock;
 using ::testing::_;
 
 namespace syncer {
 
 namespace {
 
 static const base::FilePath::CharType kTestSyncDir[] =
     FILE_PATH_LITERAL("sync-test");
 
-ACTION_P(Signal, event) {
-  event->Signal();
-}
-
 void EmptyNetworkTimeUpdate(const base::Time&,
                             const base::TimeDelta&,
                             const base::TimeDelta&) {}
 
 class TestSyncEngineHost : public SyncEngineHostStub {
  public:
   explicit TestSyncEngineHost(
       base::Callback<void(ModelTypeSet)> set_engine_types)
       : set_engine_types_(set_engine_types) {}
 
@@ skipping 744 matching lines @@
   backend_->StopSyncingForShutdown();
   // Verify that call to DeactivateNonBlockingDataType doesn't assert.
   backend_->DeactivateNonBlockingDataType(AUTOFILL);
   backend_->Shutdown(STOP_SYNC);
   backend_.reset();
 }
 
 }  // namespace
 
 }  // namespace syncer