Fuchsia: Use new call to get thread CPU time

runtime/bin/thread_macos.cc

Index: runtime/bin/thread_macos.cc
diff --git a/runtime/bin/thread_macos.cc b/runtime/bin/thread_macos.cc
index b63b0b929cd61feaadc6bbf1c3e1c962b471d7ff..dc76aaacbb515f0120495587b5fd74f5e54b311e 100644
--- a/runtime/bin/thread_macos.cc
+++ b/runtime/bin/thread_macos.cc
@@ -158,30 +158,6 @@ bool Thread::Compare(ThreadId a, ThreadId b) {
 }
 
 
-void Thread::GetThreadCpuUsage(ThreadId thread_id, int64_t* cpu_usage) {
-  ASSERT(thread_id == GetCurrentThreadId());
-  ASSERT(cpu_usage != NULL);
-  // TODO(johnmccutchan): Enable this after fixing issue with macos directory
-  // watcher.
-  const bool get_cpu_usage = false;
-  if (get_cpu_usage) {
-    mach_msg_type_number_t count = THREAD_BASIC_INFO_COUNT;
-    thread_basic_info_data_t info_data;
-    thread_basic_info_t info = &info_data;
-    mach_port_t thread_port = mach_thread_self();
-    kern_return_t r = thread_info(thread_port, THREAD_BASIC_INFO,
-                                  (thread_info_t)info, &count);
-    mach_port_deallocate(mach_task_self(), thread_port);
-    if (r == KERN_SUCCESS) {
-      *cpu_usage = (info->user_time.seconds * kMicrosecondsPerSecond) +
-                   info->user_time.microseconds;
-      return;
-    }
-  }
-  *cpu_usage = 0;
-}
-
-
 void Thread::InitOnce() {
   // Nothing to be done.
 }