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 2e914cac6575a588ec9ac31b75041b752b2d4787..eb39501bc0db930332b1975252287f3673306a72 100644
--- a/runtime/vm/thread_registry.cc
+++ b/runtime/vm/thread_registry.cc
@@ -146,7 +146,6 @@ Thread* ThreadRegistry::GetFromFreelistLocked(Isolate* isolate) {
   return thread;
 }
 
-
 void ThreadRegistry::ReturnToFreelistLocked(Thread* thread) {
   ASSERT(thread != NULL);
   ASSERT(thread->os_thread_ == NULL);
@@ -158,16 +157,4 @@ void ThreadRegistry::ReturnToFreelistLocked(Thread* thread) {
   free_list_ = thread;
 }
 
-
-intptr_t ThreadRegistry::ThreadHighWatermarksTotalLocked() const {
-  ASSERT(threads_lock()->IsOwnedByCurrentThread());
-  intptr_t max_memory_usage_total = 0;
-  Thread* current = active_list_;
-  while (current != NULL) {
-    max_memory_usage_total += current->GetThreadHighWatermark();
-    current = current->next_;
-  }
-  return max_memory_usage_total;
-}
-
 }  // namespace dart