Fix clang compiler warning for lambda variable catpure

base/trace_event/memory_dump_manager_unittest.cc

 // Copyright 2015 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/trace_event/memory_dump_manager.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
@@ skipping 756 matching lines @@
 
   RunLoop run_loop;
   scoped_refptr<SingleThreadTaskRunner> test_task_runner =
       ThreadTaskRunnerHandle::Get();
   auto quit_closure = run_loop.QuitClosure();
 
   const int kPollsToQuit = 10;
   int call_count = 0;
   MemoryDumpManager* mdm = mdm_.get();
   const auto poll_function1 = [&call_count, &test_task_runner, quit_closure,
-                               &mdp2, mdm, &options, kPollsToQuit,
-                               this](uint64_t* total) -> void {
+                               &mdp2, mdm, &options](uint64_t* total) -> void {
     ++call_count;
     if (call_count == 1)
       RegisterDumpProvider(mdp2.get(), nullptr, options, kMDPName);
     else if (call_count == 4)
       mdm->UnregisterAndDeleteDumpProviderSoon(std::move(mdp2));
     else if (call_count == kPollsToQuit)
       test_task_runner->PostTask(FROM_HERE, quit_closure);
 
     // Record increase of 1 GiB of memory at each call.
     *total = static_cast<uint64_t>(call_count) * 1024 * 1024 * 1024;
@@ skipping 497 matching lines @@
   thread.Start();
   RegisterDumpProvider(&mdp1, thread.task_runner(), kDefaultOptions,
                        "BlacklistTestDumpProvider");
   // Unregistering on wrong thread should not crash.
   mdm_->UnregisterDumpProvider(&mdp1);
   thread.Stop();
 }
 
 }  // namespace trace_event
 }  // namespace base