Clean up CodeObservers

runtime/vm/debuginfo_macos.cc

-// Copyright (c) 2011, 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 "vm/debuginfo.h"
-
-namespace dart {
-
-DebugInfo::DebugInfo() {
-  handle_ = NULL;
-}
-
-
-DebugInfo::~DebugInfo() {
-}
-
-
-void DebugInfo::AddCode(uword pc, intptr_t size) {
-  // Nothing to do as there is no support for this on macos.
-}
-
-
-void DebugInfo::AddCodeRegion(const char* name, uword pc, intptr_t size) {
-  // Nothing to do as there is no support for this on macos.
-}
-
-
-bool DebugInfo::WriteToMemory(ByteBuffer* region) {
-  // Nothing to do as there is no support for this on macos.
-  return false;
-}
-
-
-DebugInfo* DebugInfo::NewGenerator() {
-  return new DebugInfo();
-}
-
-
-void DebugInfo::RegisterSection(const char* name,
-                                uword entry_point,
-                                intptr_t size) {
-  // Nothing to do as there is no support for this on macos.
-}
-
-
-void DebugInfo::UnregisterAllSections() {
-  // Nothing to do as there is no support for this on macos.
-}
-
-}  // namespace dart