Revert "Added isolate + thread high watermark tracking to Observatory"

runtime/vm/thread_registry.cc

Index: runtime/vm/thread_registry.cc
diff --git a/runtime/vm/thread_registry.cc b/runtime/vm/thread_registry.cc
index 1483b131ec656200fca367f46a2028489d1b0baa..4694cc06a8771c7590f5e378d8bb171aefb851f3 100644
--- a/runtime/vm/thread_registry.cc
+++ b/runtime/vm/thread_registry.cc
@@ -170,7 +170,6 @@ Thread* ThreadRegistry::GetFromFreelistLocked(Isolate* isolate) {
   return thread;
 }
 
-
 void ThreadRegistry::ReturnToFreelistLocked(Thread* thread) {
   ASSERT(thread != NULL);
   ASSERT(thread->os_thread_ == NULL);
@@ -182,16 +181,4 @@ void ThreadRegistry::ReturnToFreelistLocked(Thread* thread) {
   free_list_ = thread;
 }
 
-
-uint ThreadRegistry::ThreadHighWatermarksTotalLocked() const {
-  ASSERT(threads_lock()->IsOwnedByCurrentThread());
-  uint memory_high_watermarks_total = 0;
-  Thread* current = active_list_;
-  while (current != NULL) {
-    memory_high_watermarks_total += current->memory_high_watermark();
-    current = current->next_;
-  }
-  return memory_high_watermarks_total;
-}
-
 }  // namespace dart