Revert "Switch profiler from isolates to threads"

runtime/vm/thread_test.cc

Index: runtime/vm/thread_test.cc
diff --git a/runtime/vm/thread_test.cc b/runtime/vm/thread_test.cc
index 7eb5849d422f1c449aa65c8b91fa9a9767a5faba..9eaf79138cff317d4d6f5bcf017bab89e1c8da1e 100644
--- a/runtime/vm/thread_test.cc
+++ b/runtime/vm/thread_test.cc
@@ -39,8 +39,10 @@ UNIT_TEST_CASE(Monitor) {
   Dart_CreateIsolate(
       NULL, NULL, bin::isolate_snapshot_buffer, NULL, NULL, NULL);
   Thread* thread = Thread::Current();
+  Isolate* isolate = thread->isolate();
   // Thread interrupter interferes with this test, disable interrupts.
-  thread->DisableThreadInterrupts();
+  thread->SetThreadInterrupter(NULL, NULL);
+  Profiler::EndExecution(isolate);
   Monitor* monitor = new Monitor();
   monitor->Enter();
   monitor->Exit();