Backed out 3 changesets (bug 1217501) for m(4) leaks CLOSED TREE

Backed out changeset f00f079f712b (bug 1217501)
Backed out changeset 86ac4feb0e38 (bug 1217501)
Backed out changeset 0c7e876a69e5 (bug 1217501)

dom/fetch/FetchDriver.cpp

@@ -303,11 +303,7 @@ FetchDriver::HttpFetch()
     // Set the same headers.
     nsAutoTArray<InternalHeaders::Entry, 5> headers;
     mRequest->Headers()->GetEntries(headers);
-    bool hasAccept = false;
     for (uint32_t i = 0; i < headers.Length(); ++i) {
-      if (!hasAccept && headers[i].mName.EqualsLiteral("accept")) {
-        hasAccept = true;
-      }
       if (headers[i].mValue.IsEmpty()) {
         httpChan->SetEmptyRequestHeader(headers[i].mName);
       } else {
@@ -315,12 +311,6 @@ FetchDriver::HttpFetch()
       }
     }
 
-    if (!hasAccept) {
-      httpChan->SetRequestHeader(NS_LITERAL_CSTRING("accept"),
-                                 NS_LITERAL_CSTRING("*/*"),
-                                 false /* merge */);
-    }
-
     // Step 2. Set the referrer.
     nsAutoString referrer;
     mRequest->GetReferrer(referrer);