[net] Remove logic for fixing up Gzip encoding type for downloads.

net/filter/filter.h

Index: net/filter/filter.h
diff --git a/net/filter/filter.h b/net/filter/filter.h
index 428dc8cd21dd318bfa83ac7e617b2a1e2ca72e0d..1904a8cdbb957be08b6baf3ef509d56a130a31ec 100644
--- a/net/filter/filter.h
+++ b/net/filter/filter.h
@@ -102,19 +102,12 @@ class NET_EXPORT_PRIVATE FilterContext {
   // Return false if gurl is not present.
   virtual bool GetURL(GURL* gurl) const = 0;
 
-  // What Content-Disposition header came with this data?
-  // Return false if no header was present.
-  virtual bool GetContentDisposition(std::string* disposition) const = 0;
-
   // When was this data requested from a server?
   virtual base::Time GetRequestTime() const = 0;
 
   // Is data supplied from cache, or fresh across the net?
   virtual bool IsCachedContent() const = 0;
 
-  // Is this a download?
-  virtual bool IsDownload() const = 0;
-
   // Was this data flagged as a response to a request with an SDCH dictionary?
   virtual SdchManager::DictionarySet* SdchDictionariesAdvertised() const = 0;