Fix content-encoding handling with buggy servers.

net/filter/filter.h

Index: net/filter/filter.h
diff --git a/net/filter/filter.h b/net/filter/filter.h
index 1b4d2f5bf2454fa5f3b783e6a9241b3fc7a2b16e..441fbf36b5a776f83480b8dbad5c108f34d2c7a7 100644
--- a/net/filter/filter.h
+++ b/net/filter/filter.h
@@ -74,6 +74,10 @@ class NET_EXPORT_PRIVATE FilterContext {
   // Return false if gurl is not present.
   virtual bool GetURL(GURL* gurl) const = 0;
 
+  // What filename did the server say to use for the file?
+  // Return false if there was no such filename.
+  virtual bool GetFilename(std::string* filename) const = 0;
+
   // When was this data requested from a server?
   virtual base::Time GetRequestTime() const = 0;