Revert "Allow XHR timeout attribute to be overridden after send(), per spec"

Source/core/xml/XMLHttpRequest.cpp

Index: Source/core/xml/XMLHttpRequest.cpp
diff --git a/Source/core/xml/XMLHttpRequest.cpp b/Source/core/xml/XMLHttpRequest.cpp
index 076a7ea07f209af1911bf08b61ed232724933cc7..305774dd0cfad72816dff90796dfd41f87cea206 100644
--- a/Source/core/xml/XMLHttpRequest.cpp
+++ b/Source/core/xml/XMLHttpRequest.cpp
@@ -346,16 +346,7 @@ void XMLHttpRequest::setTimeout(unsigned long timeout, ExceptionState& exception
         exceptionState.throwDOMException(InvalidAccessError, "Timeouts cannot be set for synchronous requests made from a document.");
         return;
     }
-
     m_timeoutMilliseconds = timeout;
-
-    // From http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute:
-    // Note: This implies that the timeout attribute can be set while fetching is in progress. If
-    // that occurs it will still be measured relative to the start of fetching.
-    //
-    // The timeout may be overridden after send.
-    if (m_loader)
-        m_loader->overrideTimeout(timeout);
 }
 
 void XMLHttpRequest::setResponseType(const String& responseType, ExceptionState& exceptionState)