Fixes some memory leaks in //runtime/bin

runtime/bin/file_system_watcher_win.cc

 // Copyright (c) 2013, 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(TARGET_OS_WINDOWS)
 
 #include "bin/file_system_watcher.h"
 #include "bin/eventhandler.h"
 
@@ skipping 31 matching lines @@
   const wchar_t* name = StringUtilsWin::Utf8ToWide(path);
   HANDLE dir = CreateFileW(name,
                            FILE_LIST_DIRECTORY,
                            FILE_SHARE_READ |
                                FILE_SHARE_WRITE |
                                FILE_SHARE_DELETE,
                            NULL,
                            OPEN_EXISTING,
                            FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED,
                            NULL);
-  free(const_cast<wchar_t*>(name));
 
   if (dir == INVALID_HANDLE_VALUE) {
     return -1;
   }
 
   int list_events = 0;
   if (events & (kCreate | kMove | kDelete)) {
     list_events |= FILE_NOTIFY_CHANGE_FILE_NAME |
                    FILE_NOTIFY_CHANGE_DIR_NAME;
   }
@@ skipping 23 matching lines @@
 }
 
 
 Dart_Handle FileSystemWatcher::ReadEvents(intptr_t id, intptr_t path_id) {
   USE(id);
   const intptr_t kEventSize = sizeof(FILE_NOTIFY_INFORMATION);
   DirectoryWatchHandle* dir = reinterpret_cast<DirectoryWatchHandle*>(path_id);
   intptr_t available = dir->Available();
   intptr_t max_count = available / kEventSize + 1;
   Dart_Handle events = Dart_NewList(max_count);
-  uint8_t* buffer = new uint8_t[available];
+  uint8_t* buffer = Dart_ScopeAllocate(available);
   intptr_t bytes = dir->Read(buffer, available);
   intptr_t offset = 0;
   intptr_t i = 0;
   while (offset < bytes) {
     FILE_NOTIFY_INFORMATION* e =
         reinterpret_cast<FILE_NOTIFY_INFORMATION*>(buffer + offset);
 
     Dart_Handle event = Dart_NewList(5);
     int mask = 0;
     if (e->Action == FILE_ACTION_ADDED) mask |= kCreate;
     if (e->Action == FILE_ACTION_REMOVED) mask |= kDelete;
     if (e->Action == FILE_ACTION_MODIFIED) mask |= kModifyContent;
     if (e->Action == FILE_ACTION_RENAMED_OLD_NAME) mask |= kMove;
     if (e->Action == FILE_ACTION_RENAMED_NEW_NAME) mask |= kMove;
     Dart_ListSetAt(event, 0, Dart_NewInteger(mask));
     // Move events come in pairs. Just 'enable' by default.
     Dart_ListSetAt(event, 1, Dart_NewInteger(1));
     Dart_ListSetAt(event, 2, Dart_NewStringFromUTF16(
         reinterpret_cast<uint16_t*>(e->FileName), e->FileNameLength / 2));
     Dart_ListSetAt(event, 3, Dart_NewBoolean(true));
     Dart_ListSetAt(event, 4, Dart_NewInteger(path_id));
     Dart_ListSetAt(events, i, event);
     i++;
     if (e->NextEntryOffset == 0) break;
     offset += e->NextEntryOffset;
   }
-  delete[] buffer;
   return events;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)