Fix content-encoding handling with buggy servers.

net/filter/mock_filter_context.cc

Index: net/filter/mock_filter_context.cc
diff --git a/net/filter/mock_filter_context.cc b/net/filter/mock_filter_context.cc
index ec6db0111c62b1951ceae4bf59564288808dd7e3..06905c0e070790be3cc532623f9c980d328cf4c5 100644
--- a/net/filter/mock_filter_context.cc
+++ b/net/filter/mock_filter_context.cc
@@ -27,6 +27,13 @@ bool MockFilterContext::GetURL(GURL* gurl) const {
   return true;
 }
 
+bool MockFilterContext::GetContentDisposition(std::string* disposition) const {
+  if (content_disposition_.empty())
+    return false;
+  *disposition = content_disposition_;
+  return true;
+}
+
 // What was this data requested from a server?
 base::Time MockFilterContext::GetRequestTime() const {
   return request_time_;