Revert "Fixed issue in MallocHooks where a MallocHookScope was accidentally removed during a merge,…

runtime/vm/malloc_hooks_unsupported.cc

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 
-#if !defined(DART_USE_TCMALLOC) || defined(PRODUCT) ||                         \
-    defined(TARGET_ARCH_DBC) || defined(TARGET_OS_FUCHSIA)
+#if !defined(DART_USE_TCMALLOC) || defined(PRODUCT)
 
 #include "vm/malloc_hooks.h"
 
 namespace dart {
 
 void MallocHooks::InitOnce() {
   // Do nothing.
 }
 
 
 void MallocHooks::TearDown() {
   // Do nothing.
 }
 
 
-bool MallocHooks::ProfilingEnabled() {
-  return false;
-}
-
-
-bool MallocHooks::stack_trace_collection_enabled() {
-  return false;
-}
-
-
-void MallocHooks::set_stack_trace_collection_enabled(bool enabled) {
-  // Do nothing.
-}
-
-
 void MallocHooks::ResetStats() {
   // Do nothing.
 }
 
 
 bool MallocHooks::Active() {
   return false;
 }
 
 
 void MallocHooks::PrintToJSONObject(JSONObject* jsobj) {
   // Do nothing.
 }
 
 
 intptr_t MallocHooks::allocation_count() {
   return 0;
 }
 
 
 intptr_t MallocHooks::heap_allocated_memory_in_bytes() {
   return 0;
 }
 
 }  // namespace dart
 
-#endif  // !defined(DART_USE_TCMALLOC) || defined(PRODUCT) ||
-        // defined(TARGET_ARCH_DBC) || defined(TARGET_OS_FUCHSIA)
+#endif  // defined(DART_USE_TCMALLOC) || defined(PRODUCT)