content_shell: Fix a regression for paths starting with /media/.

components/test_runner/web_frame_test_client.cc

Index: components/test_runner/web_frame_test_client.cc
diff --git a/components/test_runner/web_frame_test_client.cc b/components/test_runner/web_frame_test_client.cc
index 54fe96cf4faccaae73e86bd9adddfdc1e19a02f6..03c5c9e6d7359c58700ecf286bba2a3046ef3624 100644
--- a/components/test_runner/web_frame_test_client.cc
+++ b/components/test_runner/web_frame_test_client.cc
@@ -598,6 +598,10 @@ void WebFrameTestClient::willSendRequest(
     }
   }
 
+  if (!test_runner_->did_request_after_reset()) {
+    test_runner_->set_did_request_after_reset();
+    return;
+  }
   // Set the new substituted URL.
   request.setURL(
       delegate_->RewriteLayoutTestsURL(request.url().string().utf8()));