Update from https://crrev.com/307330

base/process/process_metrics_posix.cc

 // Copyright (c) 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/process/process_metrics.h"
 
 #include <sys/resource.h>
 #include <sys/time.h>
 
 #include "base/logging.h"
 
 namespace base {
 
 int64 TimeValToMicroseconds(const struct timeval& tv) {
-  static const int kMicrosecondsPerSecond = 1000000;
   int64 ret = tv.tv_sec;  // Avoid (int * int) integer overflow.
-  ret *= kMicrosecondsPerSecond;
+  ret *= Time::kMicrosecondsPerSecond;
   ret += tv.tv_usec;
   return ret;
 }
 
 ProcessMetrics::~ProcessMetrics() { }
 
 #if defined(OS_LINUX)
 static const rlim_t kSystemDefaultMaxFds = 8192;
 #elif defined(OS_MACOSX)
 static const rlim_t kSystemDefaultMaxFds = 256;
@@ skipping 35 matching lines @@
     limits.rlim_cur = new_limit;
     if (setrlimit(RLIMIT_NOFILE, &limits) != 0) {
       PLOG(INFO) << "Failed to set file descriptor limit";
     }
   } else {
     PLOG(INFO) << "Failed to get file descriptor limit";
   }
 }
 
 }  // namespace base