Disable enforced throttling for URL requests.

The throttling feature rejects outbound HTTP requests to a server for a period of time, when it finds that the server is returning 5XX.
This change disables the feature.

TEST=none
BUG=70412

Review URL: http://codereview.chromium.org/6369007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72214 0039d316-1c4b-4281-b951-d872f2087c98

net/url_request/url_request_http_job.cc

@@ -219,15 +219,8 @@ void URLRequestHttpJob::StartTransaction() {
     rv = request_->context()->http_transaction_factory()->CreateTransaction(
         &transaction_);
     if (rv == OK) {
-      if (!throttling_entry_->IsDuringExponentialBackoff() ||
-          !net::URLRequestThrottlerManager::GetInstance()->
-              enforce_throttling()) {
       rv = transaction_->Start(
           &request_info_, &start_callback_, request_->net_log());
-      } else {
-        // Special error code for the exponential back-off module.
-        rv = ERR_TEMPORARILY_THROTTLED;
-      }
       // Make sure the context is alive for the duration of the
       // transaction.
       context_ = request_->context();