win: Work towards getting 'minidump' to compile

minidump/minidump_exception_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_EXCEPTION_WRITER_H_
 #define CRASHPAD_MINIDUMP_MINIDUMP_EXCEPTION_WRITER_H_
 
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#endif  // OS_WIN
+
 #include <dbghelp.h>
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "minidump/minidump_stream_writer.h"
 #include "minidump/minidump_thread_id_map.h"
 
@@ skipping 86 matching lines @@
  private:
   MINIDUMP_EXCEPTION_STREAM exception_;
   scoped_ptr<MinidumpContextWriter> context_;
 
   DISALLOW_COPY_AND_ASSIGN(MinidumpExceptionWriter);
 };
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_MINIDUMP_MINIDUMP_EXCEPTION_WRITER_H_