Migrate chrome/browser files to histogram_macros.h includes.

chrome/browser/chrome_child_process_watcher.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 "chrome/browser/chrome_child_process_watcher.h"
 
 #include "base/command_line.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "chrome/common/chrome_result_codes.h"
 #include "chrome/common/chrome_switches.h"
 #include "content/public/browser/browser_child_process_observer.h"
 #include "content/public/browser/child_process_data.h"
 
 namespace {
 
 void AnalyzeCrash(int exit_code) {
   if (exit_code == chrome::RESULT_CODE_INVALID_SANDBOX_STATE) {
     base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
@@ skipping 13 matching lines @@
 
 ChromeChildProcessWatcher::~ChromeChildProcessWatcher() {
   BrowserChildProcessObserver::Remove(this);
 }
 
 void ChromeChildProcessWatcher::BrowserChildProcessCrashed(
     const content::ChildProcessData& data,
     int exit_code) {
   AnalyzeCrash(exit_code);
 }