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.cpp

@@ -52,7 +52,6 @@ static const U32 HTTP_STATUS_PIPE_ERROR = 499;
 /**
  * String constants
  */
-const std::string CONTEXT_DEST_URI_SD_LABEL("dest_uri");
 const std::string CONTEXT_TRANSFERED_BYTES("transfered_bytes");
 
 
@@ -715,42 +714,6 @@ static size_t headerCallback(char* header_line, size_t size, size_t nmemb, void*
 	return header_len;
 }
 
-static LLFastTimer::DeclareTimer FTM_PROCESS_URL_EXTRACTOR("URL Extractor");
-/**
- * LLContextURLExtractor
- */
-// virtual
-LLIOPipe::EStatus LLContextURLExtractor::process_impl(
-	const LLChannelDescriptors& channels,
-	buffer_ptr_t& buffer,
-	bool& eos,
-	LLSD& context,
-	LLPumpIO* pump)
-{
-	LLFastTimer t(FTM_PROCESS_URL_EXTRACTOR);
-	PUMP_DEBUG;
-	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
-	// The destination host is in the context.
-	if(context.isUndefined() || !mRequest)
-	{
-		return STATUS_PRECONDITION_NOT_MET;
-	}
-
-	// copy in to out, since this just extract the URL and does not
-	// actually change the data.
-	LLChangeChannel change(channels.in(), channels.out());
-	std::for_each(buffer->beginSegment(), buffer->endSegment(), change);
-
-	// find the context url
-	if(context.has(CONTEXT_DEST_URI_SD_LABEL))
-	{
-		mRequest->setURL(context[CONTEXT_DEST_URI_SD_LABEL].asString());
-		return STATUS_DONE;
-	}
-	return STATUS_ERROR;
-}
-
-
 /**
  * LLURLRequestComplete
  */