Fixed a bug with URLFetcher where retrying the request would append the new r...

chrome/common/net/url_fetcher.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/net/url_fetcher.h"
 
 #include <set>
 
 #include "base/compiler_specific.h"
 #include "base/lazy_instance.h"
@@ skipping 344 matching lines @@
       request_->set_method("HEAD");
       break;
 
     default:
       NOTREACHED();
   }
 
   if (!extra_request_headers_.IsEmpty())
     request_->SetExtraRequestHeaders(extra_request_headers_);
 
+  // There might be data left over from a previous request attempt.
+  data_.clear();
+
   request_->Start();
 }
 
 void URLFetcher::Core::StartURLRequestWhenAppropriate() {
   DCHECK(io_message_loop_proxy_->BelongsToCurrentThread());
 
   if (was_cancelled_)
     return;
 
   if (original_url_throttler_entry_ == NULL) {
@@ skipping 141 matching lines @@
 }
 
 // static
 void URLFetcher::CancelAll() {
   Core::CancelAll();
 }
 
 URLFetcher::Delegate* URLFetcher::delegate() const {
   return core_->delegate();
 }