Make SdchManager per-profile.

net/filter/filter.h

Index: net/filter/filter.h
diff --git a/net/filter/filter.h b/net/filter/filter.h
index 81890997ef3b7e34e8445cf81e741b3640cfeafa..70509f4ced58bccd22c6bf479c592ae612445d0f 100644
--- a/net/filter/filter.h
+++ b/net/filter/filter.h
@@ -43,6 +43,7 @@ class GURL;
 
 namespace net {
 
+class URLRequestContext;
 class IOBuffer;
 
 //------------------------------------------------------------------------------
@@ -98,6 +99,9 @@ class NET_EXPORT_PRIVATE FilterContext {
   // For example: 200 is ok.   4xx are error codes. etc.
   virtual int GetResponseCode() const = 0;
 
+  // The URLRequestContext associated with the request.
+  virtual const URLRequestContext* GetURLRequestContext() const = 0;
+
   // The following method forces the context to emit a specific set of
   // statistics as selected by the argument.
   virtual void RecordPacketStats(StatisticSelector statistic) const = 0;