pkg/protobuf: cleanup and prep for 0.3.5 release

lib/src/protobuf/coded_buffer_reader.dart

 // Copyright (c) 2011, 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.
 
 part of protobuf;
 
 class CodedBufferReader {
   static const int DEFAULT_RECURSION_LIMIT = 64;
   static const int DEFAULT_SIZE_LIMIT = 64 << 20;
 
@@ skipping 43 matching lines @@
   }
 
   void _checkLimit(int increment) {
     assert(_currentLimit != -1);
     _bufferPos += increment;
     if (_bufferPos > _currentLimit) {
       throw new InvalidProtocolBufferException.truncatedMessage();
     }
   }
 
-  bool _canRead(int increment) => _bufferPos + increment <= _currentLimit;
-
   void readGroup(int fieldNumber, GeneratedMessage message,
                  ExtensionRegistry extensionRegistry) {
     if (_recursionDepth >= _recursionLimit) {
       throw new InvalidProtocolBufferException.recursionLimitExceeded();
     }
     ++_recursionDepth;
     message.mergeFromCodedBufferReader(this);
     checkLastTagWas(makeTag(fieldNumber, WIRETYPE_END_GROUP));
     --_recursionDepth;
   }
@@ skipping 133 matching lines @@
     }
     throw new InvalidProtocolBufferException.malformedVarint();
   }
 
   ByteData _readByteData(int sizeInBytes) {
     _checkLimit(sizeInBytes);
     return new ByteData.view(
         _buffer.buffer, _bufferPos - sizeInBytes, sizeInBytes);
   }
 }