minidump: Use forward declarations in more places

minidump/minidump_thread_writer.h

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #ifndef CRASHPAD_MINIDUMP_MINIDUMP_THREAD_WRITER_H_
 #define CRASHPAD_MINIDUMP_MINIDUMP_THREAD_WRITER_H_
 
 #include <dbghelp.h>
 #include <stdint.h>
-#include <sys/types.h>
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "minidump/minidump_stream_writer.h"
 #include "minidump/minidump_writable.h"
-#include "util/file/file_writer.h"
 
 namespace crashpad {
 
 class MinidumpContextWriter;
 class MinidumpMemoryListWriter;
 class MinidumpMemoryWriter;
 
 //! \brief The writer for a MINIDUMP_THREAD object in a minidump file.
 //!
 //! Because MINIDUMP_THREAD objects only appear as elements of
@@ skipping 138 matching lines @@
   MINIDUMP_THREAD_LIST thread_list_base_;
   std::vector<MinidumpThreadWriter*> threads_;  // weak
   MinidumpMemoryListWriter* memory_list_writer_;  // weak
 
   DISALLOW_COPY_AND_ASSIGN(MinidumpThreadListWriter);
 };
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_MINIDUMP_MINIDUMP_THREAD_WRITER_H_