Make SdchManager per-profile.

net/filter/sdch_filter.h

 // Copyright 2014 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.
 
 // SdchFilter applies open_vcdiff content decoding to a datastream.
 // This decoding uses a pre-cached dictionary of text fragments to decode
 // (expand) the stream back to its original contents.
 //
 // This SdchFilter internally uses open_vcdiff/vcdec library to do decoding.
 //
@@ skipping 77 matching lines @@
   // encoding.  If the hash is not plausible, then the payload is probably not
   // an SDCH encoded bundle, and various error recovery strategies can be
   // attempted.
   bool dictionary_hash_is_plausible_;
 
   // We hold an in-memory copy of the dictionary during the entire decoding, as
   // it is used directly by the VC-DIFF decoding system.
   // That char* data is part of the dictionary_ we hold a reference to.
   scoped_refptr<SdchManager::Dictionary> dictionary_;
 
+  // We keep a copy of the URLRequestContext for use in the destructor, (at
+  // which point GetURLRequestContext() will likely return null because of
+  // the disassociation of the URLRequest from the URLRequestJob).  This is
+  // safe because the URLRequestJob (and any filters) are guaranteed to be
+  // deleted before the URLRequestContext is destroyed.
+  const URLRequestContext * const url_request_context_;

[jar (doing other things), 2014/06/13 18:28:48]

nit: no space before the asterisk. (like lines 43, 44, 66).

The style guide specifically asks that you not put a space on both sides.... and
leaves either side as allowed... but...

Chromium tends to standardize on putting the space *only* after the asterisk
(despite the fact that the parsing binds the asterisk more tightly to what is on
its right :-/).

[Randy Smith (Not in Mondays), 2014/06/13 19:40:12]

Whoops; done.

+
   // The decoder may demand a larger output buffer than the target of
   // ReadFilteredData so we buffer the excess output between calls.
   std::string dest_buffer_excess_;
   // To avoid moving strings around too much, we save the index into
   // dest_buffer_excess_ that has the next byte to output.
   size_t dest_buffer_excess_index_;
 
   // To get stats on activities, we keep track of source and target bytes.
   // Visit about:histograms/Sdch to see histogram data.
   size_t source_bytes_;
@@ skipping 11 matching lines @@
   // To facilitate error recovery, allow filter to know if content is text/html
   // by checking within this mime type (we may do a meta-refresh via html).
   std::string mime_type_;
 
   DISALLOW_COPY_AND_ASSIGN(SdchFilter);
 };
 
 }  // namespace net
 
 #endif  // NET_FILTER_SDCH_FILTER_H_