Fix content-encoding handling with buggy servers.

net/filter/filter.cc

Index: net/filter/filter.cc
diff --git a/net/filter/filter.cc b/net/filter/filter.cc
index 244abaea10eead6e52ac95e5b52af3862c6f64ff..e45ff14a278c61122139132a02ffe370668687c4 100644
--- a/net/filter/filter.cc
+++ b/net/filter/filter.cc
@@ -170,10 +170,14 @@ void Filter::FixupEncodingTypes(
       encoding_types->clear();
 
     GURL url;
+    std::string server_filename;
     success = filter_context.GetURL(&url);
     DCHECK(success);
-    base::FilePath filename =
-        base::FilePath().AppendASCII(url.ExtractFileName());
+    base::FilePath filename;
+    if (filter_context.GetFilename(&server_filename))
+      filename = base::FilePath().AppendASCII(server_filename);

[asanka, 2014/03/20 23:07:16]

Nit: server_filename is UTF-8, not necessarily ASCII, if it's obtained via
HttpContentDisposition. The encoding of url may not be ASCII either. 

Passing a non-ASCII string to AppendASCII isn't terrible since we are only
interested in extracting the extension and matching it against ASCII strings.
However, it'll trip a DCHECK on a DCHECK enabled build and relies on
implementation quirks to work.

+    else
+      filename = base::FilePath().AppendASCII(url.ExtractFileName());
     base::FilePath::StringType extension = filename.Extension();
 
     if (filter_context.IsDownload()) {