Give the filter setup more context so it can figure out whether it's download...

net/base/filter.cc

 // Copyright (c) 2006-2008 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.
 
 #include "net/base/filter.h"
 
 #include "base/file_path.h"
 #include "base/string_util.h"
 #include "net/base/gzip_filter.h"
 #include "net/base/bzip2_filter.h"
@@ skipping 86 matching lines @@
 
     GURL url;
     success = filter_context.GetURL(&url);
     DCHECK(success);
     FilePath filename = FilePath().AppendASCII(url.ExtractFileName());
     FilePath::StringType extension = filename.Extension();
 
     // Firefox does not apply the filter to the following extensions.
     // See Firefox's nsHttpChannel::nsContentEncodings::GetNext() and
     // nonDecodableExtensions in nsExternalHelperAppService.cpp
+    // For the case of svgz files, we use the extension to distinguish
+    // between svgz files and svg files compressed with gzip by the server.
+    // When viewing a .svgz file, we need to uncompress it, but we don't
+    // want to do that when downloading.
     if (0 == extension.compare(FILE_PATH_LITERAL(".gz")) ||
         0 == extension.compare(FILE_PATH_LITERAL(".tgz")) ||
-        0 == extension.compare(FILE_PATH_LITERAL(".svgz"))) {
+        (0 == extension.compare(FILE_PATH_LITERAL(".svgz")) &&
+        filter_context.IsDownload())) {
       encoding_types->clear();
     }
   }
 
   if (!filter_context.IsSdchResponse()) {
     if (1 < encoding_types->size()) {
       // Multiple filters were intended to only be used for SDCH (thus far!)
       SdchManager::SdchErrorRecovery(
           SdchManager::MULTIENCODING_FOR_NON_SDCH_REQUEST);
     }
@@ skipping 234 matching lines @@
 
   DCHECK(stream_buffer());
   // Bail out if there is more data in the stream buffer to be filtered.
   if (!stream_buffer() || stream_data_len_)
     return false;
 
   next_stream_data_ = stream_buffer()->data();
   stream_data_len_ = stream_data_len;
   return true;
 }