Bug 1310127 - Part 12: Use MOZ_MUST_USE in netwerk/protocol/http r=mak

MozReview-Commit-ID: Bl4CxvNCyS5

--HG--
extra : rebase_source : 2cd2ba1233cdbb875dffa3c4d35d60001b0c6fe4

browser/components/feeds/nsFeedSniffer.cpp

@@ -5,6 +5,7 @@
 
 #include "nsFeedSniffer.h"
 
+#include "mozilla/Unused.h"
 
 #include "nsNetCID.h"
 #include "nsXPCOM.h"
@@ -57,8 +58,8 @@ nsFeedSniffer::ConvertEncodedData(nsIRequest* request,
     return NS_ERROR_NO_INTERFACE;
 
   nsAutoCString contentEncoding;
-  httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("Content-Encoding"), 
-                                 contentEncoding);
+  mozilla::Unused << httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("Content-Encoding"),
+                                                    contentEncoding);
   if (!contentEncoding.IsEmpty()) {
     nsCOMPtr<nsIStreamConverterService> converterService(do_GetService(NS_STREAMCONVERTERSERVICE_CONTRACTID));
     if (converterService) {
@@ -213,7 +214,7 @@ nsFeedSniffer::GetMIMETypeFromContent(nsIRequest* request,
 
   // Check that this is a GET request, since you can't subscribe to a POST...
   nsAutoCString method;
-  channel->GetRequestMethod(method);
+  mozilla::Unused << channel->GetRequestMethod(method);
   if (!method.EqualsLiteral("GET")) {
     sniffedType.Truncate();
     return NS_OK;
@@ -265,8 +266,10 @@ nsFeedSniffer::GetMIMETypeFromContent(nsIRequest* request,
 
     // set the feed header as a response header, since we have good metadata
     // telling us that the feed is supposed to be RSS or Atom
-    channel->SetResponseHeader(NS_LITERAL_CSTRING("X-Moz-Is-Feed"),
-                               NS_LITERAL_CSTRING("1"), false);
+    mozilla::DebugOnly<nsresult> rv =
+      channel->SetResponseHeader(NS_LITERAL_CSTRING("X-Moz-Is-Feed"),
+                                 NS_LITERAL_CSTRING("1"), false);
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
     sniffedType.AssignLiteral(TYPE_MAYBE_FEED);
     return NS_OK;
   }