minidump: Use forward declarations in more places

minidump/minidump_simple_string_dictionary_writer.cc

 // 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.
 
 #include "minidump/minidump_simple_string_dictionary_writer.h"
 
 #include "base/logging.h"
+#include "util/file/file_writer.h"
 #include "util/numeric/safe_assignment.h"
 
 namespace crashpad {
 
 MinidumpSimpleStringDictionaryEntryWriter::
     MinidumpSimpleStringDictionaryEntryWriter()
     : MinidumpWritable(), entry_(), key_(), value_() {
 }
 
 MinidumpSimpleStringDictionaryEntryWriter::
@@ skipping 121 matching lines @@
     for (const auto& key_entry : entries_) {
       iov.iov_base = key_entry.second->MinidumpSimpleStringDictionaryEntry();
       iovecs.push_back(iov);
     }
   }
 
   return file_writer->WriteIoVec(&iovecs);
 }
 
 }  // namespace crashpad