Remove GetInputStreamBufferSize() method from FilterContext.

net/base/gzip_filter.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // GZipFilter applies gzip and deflate content encoding/decoding to a data
 // stream. As specified by HTTP 1.1, with gzip encoding the content is
 // wrapped with a gzip header, and with deflate encoding the content is in
 // a raw, headerless DEFLATE stream.
 //
 // Internally GZipFilter uses zlib inflate to do decoding.
@@ skipping 10 matching lines @@
 #include "net/base/filter.h"
 
 typedef struct z_stream_s z_stream;
 
 namespace net {
 
 class GZipHeader;
 
 class GZipFilter : public Filter {
  public:
-  explicit GZipFilter(const FilterContext& filter_context);
-
   virtual ~GZipFilter();
 
   // Initializes filter decoding mode and internal control blocks.
   // Parameter filter_type specifies the type of filter, which corresponds to
   // either gzip or deflate decoding. The function returns true if success and
   // false otherwise.
   // The filter can only be initialized once.
   bool InitDecoding(Filter::FilterType filter_type);
 
   // Decodes the pre-filter data and writes the output into the dest_buffer
@@ skipping 25 matching lines @@
   };
 
   enum GZipCheckHeaderState {
     GZIP_CHECK_HEADER_IN_PROGRESS,
     GZIP_GET_COMPLETE_HEADER,
     GZIP_GET_INVALID_HEADER
   };
 
   static const int kGZipFooterSize = 8;
 
+  // Only to be instantiated by Filter::Factory.
+  explicit GZipFilter(const FilterContext& filter_context);
+  friend class Filter;
+
   // Parses and verifies the GZip header.
   // Upon exit, the function updates gzip_header_status_ accordingly.
   //
   // The function returns Filter::FILTER_OK if it gets a complete header and
   // there are more data in the pre-filter buffer.
   // The function returns Filter::FILTER_NEED_MORE_DATA if it parses all data
   // in the pre-filter buffer, either getting a complete header or a partial
   // header. The caller needs to check gzip_header_status_ and call this
   // function again for partial header.
   // The function returns Filter::FILTER_ERROR if error occurs.
@@ skipping 52 matching lines @@
   // If this flag is set, then we will revert to being a pass through filter if
   // we don't get a valid gzip header.
   bool possible_sdch_pass_through_;
 
   DISALLOW_COPY_AND_ASSIGN(GZipFilter);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_GZIP_FILTER_H__