win: Work towards getting 'minidump' to compile

minidump/test/minidump_string_writer_test_util.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_TEST_MINIDUMP_STRING_WRITER_TEST_UTIL_H_
 #define CRASHPAD_MINIDUMP_TEST_MINIDUMP_STRING_WRITER_TEST_UTIL_H_
 
+#include <windows.h>
 #include <dbghelp.h>
 
 #include <string>
 
 #include "base/strings/string16.h"
 
 namespace crashpad {
 
 struct MinidumpUTF8String;
 
@@ skipping 66 matching lines @@
 //!     failure, raises a gtest assertion and returns an empty string.
 //!
 //! \sa MinidumpStringAtRVAAsString()
 std::string MinidumpUTF8StringAtRVAAsString(const std::string& file_contents,
                                             RVA rva);
 
 }  // namespace test
 }  // namespace crashpad
 
 #endif  // CRASHPAD_MINIDUMP_TEST_MINIDUMP_STRING_WRITER_TEST_UTIL_H_