Pin dictionaries from being deleted while request is outstanding.

net/filter/filter.h

Index: net/filter/filter.h
diff --git a/net/filter/filter.h b/net/filter/filter.h
index 13489ef02823b054e38eba6cfe0eb3569055f336..20f2bfdbfd06c4c784d933a0ca19ee4bc4cbd254 100644
--- a/net/filter/filter.h
+++ b/net/filter/filter.h
@@ -55,6 +55,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "net/base/net_export.h"
+#include "net/base/sdch_manager.h"
 
 class GURL;
 
@@ -71,6 +72,14 @@ class URLRequestContext;
 // is passed to the constructor of all those filters.  To be clear, the context
 // does NOT reflect the position in a chain, or the fact that there are prior
 // or later filters in a chain.
+//
+// TODO(rdsmith): FilterContext is a grab-bag of methods which may or may
+// not be relevant for any particular filter, and it's getting worse over
+// time.  In addition, it only supports two filters, SDCH and gzip.
+// It would make more sense to implement FilterContext as a
+// base::SupportsUserData structure to which filter-specific information
+// could be added by whatever the ultimate consumer of the filter chain is,
+// and a particular filter (if included) could access that information.
 class NET_EXPORT_PRIVATE FilterContext {
  public:
   // Enum to control what histograms are emitted near end-of-life of this
@@ -107,7 +116,7 @@ class NET_EXPORT_PRIVATE FilterContext {
   virtual bool IsDownload() const = 0;
 
   // Was this data flagged as a response to a request with an SDCH dictionary?
-  virtual bool SdchResponseExpected() const = 0;
+  virtual SdchManager::DictionarySet* SdchDictionariesAdvertised() const = 0;
 
   // How many bytes were read from the net or cache so far (and potentially
   // pushed into a filter for processing)?