Change includes of histogram.h to histogram_macros.h.

components/tracing/child/child_trace_message_filter_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 "components/tracing/child/child_trace_message_filter.h"
 
 #include <memory>
 
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/run_loop.h"
 #include "components/tracing/common/tracing_messages.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_sender.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace tracing {
 
 class FakeSender : public IPC::Sender {
@@ skipping 59 matching lines @@
   OnSetUMACallback("foo3", 1, 3, false);
 
   base::RunLoop().RunUntilIdle();
 
   EXPECT_TRUE(fake_sender_.last_message_);
   EXPECT_EQ(fake_sender_.last_message_->type(),
             TracingHostMsg_AbortBackgroundTrace::ID);
 }
 
 }  // namespace tracing