Use TimeTicks instead of gettimeofday in ProcessMetrics.

base/process/process_metrics_freebsd.cc

Index: base/process/process_metrics_freebsd.cc
diff --git a/base/process/process_metrics_freebsd.cc b/base/process/process_metrics_freebsd.cc
index fbb8a889457e593dc56e53005815a0da479c92d7..d0525f94b71f65d4bbbd6790d94242b237cefb89 100644
--- a/base/process/process_metrics_freebsd.cc
+++ b/base/process/process_metrics_freebsd.cc
@@ -8,7 +8,6 @@ namespace base {
 
 ProcessMetrics::ProcessMetrics(ProcessHandle process)
     : process_(process),
-      last_cpu_time_(0),
       last_system_time_(0),
       last_cpu_(0) {
   processor_count_ = base::SysInfo::NumberOfProcessors();
@@ -81,11 +80,6 @@ double ProcessMetrics::GetCPUUsage() {
   int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, process_ };
   size_t length = sizeof(info);
 
-  struct timeval now;
-  int retval = gettimeofday(&now, NULL);
-  if (retval)
-    return 0;
-
   if (sysctl(mib, arraysize(mib), &info, &length, NULL, 0) < 0)
     return 0;