VM: Re-format to use at most one newline between functions

runtime/vm/datastream.h

 // Copyright (c) 2012, 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.
 
 #ifndef RUNTIME_VM_DATASTREAM_H_
 #define RUNTIME_VM_DATASTREAM_H_
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/allocation.h"
@@ skipping 269 matching lines @@
   }
 
  private:
   const uint8_t* buffer_;
   const uint8_t* current_;
   const uint8_t* end_;
 
   DISALLOW_COPY_AND_ASSIGN(ReadStream);
 };
 
-
 // Stream for writing various types into a buffer.
 class WriteStream : public ValueObject {
  public:
   WriteStream(uint8_t** buffer, ReAlloc alloc, intptr_t initial_size)
       : buffer_(buffer),
         end_(NULL),
         current_(NULL),
         current_size_(0),
         alloc_(alloc),
         initial_size_(initial_size) {
@@ skipping 157 matching lines @@
   intptr_t current_size_;
   ReAlloc alloc_;
   intptr_t initial_size_;
 
   DISALLOW_COPY_AND_ASSIGN(WriteStream);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_DATASTREAM_H_