Removed dead code.

This code has been in the viewer source for a long time,
and hasn't been used for a long time (furtherest back that
I checked was Snowglobe 1.4).

Most notably, this removes LLContextURLExtractor and code
that used it because that required an API where AICurlEasyHandle
is created before an url is known, which gets in the way of
reusing connections.

indra/llmessage/llurlrequest.h

@@ -42,7 +42,6 @@
 
 
 extern const std::string CONTEXT_REQUEST;
-extern const std::string CONTEXT_DEST_URI_SD_LABEL;
 extern const std::string CONTEXT_RESPONSE;
 extern const std::string CONTEXT_TRANSFERED_BYTES;
 
@@ -276,42 +275,6 @@ private:
 	LLURLRequest(const LLURLRequest&);
 };
 
-
-/** 
- * @class LLContextURLExtractor
- * @brief This class unpacks the url out of a agent usher service so
- * it can be packed into a LLURLRequest object.
- * @see LLIOPipe
- *
- * This class assumes that the context is a map that contains an entry
- * named CONTEXT_DEST_URI_SD_LABEL.
- */
-class LLContextURLExtractor : public LLIOPipe
-{
-public:
-	LLContextURLExtractor(LLURLRequest* req) : mRequest(req) {}
-	~LLContextURLExtractor() {}
-
-protected:
-	/* @name LLIOPipe virtual implementations
-	 */
-	//@{
-	/** 
-	 * @brief Process the data in buffer
-	 */
-	virtual EStatus process_impl(
-		const LLChannelDescriptors& channels,
-		buffer_ptr_t& buffer,
-		bool& eos,
-		LLSD& context,
-		LLPumpIO* pump);
-	//@}
-
-protected:
-	LLURLRequest* mRequest;
-};
-
-
 /** 
  * @class LLURLRequestComplete
  * @brief Class which can optionally be used with an LLURLRequest to
@@ -384,11 +347,4 @@ protected:
 	EStatus mRequestStatus;
 };
 
-
-
-/**
- * External constants
- */
-extern const std::string CONTEXT_DEST_URI_SD_LABEL;
-
 #endif // LL_LLURLREQUEST_H