Do not issue preflight for crossorigin media resource loads.

content/renderer/media/android/media_info_loader.cc

 // Copyright 2013 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 "content/renderer/media/android/media_info_loader.h"
 
 #include "base/bits.h"
 #include "base/callback_helpers.h"
 #include "base/metrics/histogram.h"
 #include "third_party/WebKit/public/platform/WebURLError.h"
@@ skipping 40 matching lines @@
   if (test_loader_) {
     loader = test_loader_.Pass();
   } else {
     WebURLLoaderOptions options;
     if (cors_mode_ == blink::WebMediaPlayer::CORSModeUnspecified) {
       options.allowCredentials = true;
       options.crossOriginRequestPolicy =
           WebURLLoaderOptions::CrossOriginRequestPolicyAllow;
     } else {
       options.exposeAllResponseHeaders = true;
+      // The author header set is empty, no preflight should go ahead.
+      options.preflightPolicy = WebURLLoaderOptions::PreventPreflight;
       options.crossOriginRequestPolicy =
           WebURLLoaderOptions::CrossOriginRequestPolicyUseAccessControl;
       if (cors_mode_ == blink::WebMediaPlayer::CORSModeUseCredentials)
         options.allowCredentials = true;
     }
     loader.reset(frame->createAssociatedURLLoader(options));
   }
 
   // Start the resource loading.
   loader->loadAsynchronously(request, this);
@@ skipping 106 matching lines @@
 
 void MediaInfoLoader::DidBecomeReady(Status status) {
   UMA_HISTOGRAM_TIMES("Media.InfoLoadDelay",
                       base::TimeTicks::Now() - start_time_);
   active_loader_.reset();
   if (!ready_cb_.is_null())
     base::ResetAndReturn(&ready_cb_).Run(status);
 }
 
 }  // namespace content