Let IPC::SyncMessageFilter take advantage of thread-safe Send.

content/child/indexed_db/indexed_db_dispatcher_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 "base/memory/scoped_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/values.h"
 #include "content/child/indexed_db/indexed_db_dispatcher.h"
 #include "content/child/indexed_db/webidbcursor_impl.h"
@@ skipping 42 matching lines @@
 
   bool Send(IPC::Message* msg) override {
     delete msg;
     return true;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockDispatcher);
 };
 
+class MockSyncMessageFilter : public IPC::SyncMessageFilter {
+ public:
+  MockSyncMessageFilter()
+      : SyncMessageFilter(nullptr, false /* is_channel_send_thread_safe */) {}
+
+ private:
+  ~MockSyncMessageFilter() override {}
+};
+
 }  // namespace
 
 class IndexedDBDispatcherTest : public testing::Test {
  public:
   IndexedDBDispatcherTest()
-      : task_runner_(base::ThreadTaskRunnerHandle::Get()),
-        sync_message_filter_(new IPC::SyncMessageFilter(NULL)),
-        thread_safe_sender_(new ThreadSafeSender(task_runner_.get(),
-                                                 sync_message_filter_.get())) {}
+      : thread_safe_sender_(new ThreadSafeSender(
+            base::ThreadTaskRunnerHandle::Get(), new MockSyncMessageFilter)) {}
 
   void TearDown() override { blink::WebHeap::collectAllGarbageForTesting(); }
 
  protected:
   base::MessageLoop message_loop_;
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-  scoped_refptr<IPC::SyncMessageFilter> sync_message_filter_;
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(IndexedDBDispatcherTest);
 };
 
 TEST_F(IndexedDBDispatcherTest, ValueSizeTest) {
   const std::vector<char> data(kMaxIDBValueSizeInBytes + 1);
   const WebData value(&data.front(), data.size());
   const WebVector<WebBlobInfo> web_blob_info;
@@ skipping 253 matching lines @@
                                       cursor1_transaction_id);
 
   EXPECT_EQ(2, cursor1->reset_count());
   EXPECT_EQ(0, cursor2->reset_count());
 
   cursor1.reset();
   cursor2.reset();
 }
 
 }  // namespace content