Avoid cross-origin iframe issues when loading PDF in print preview

content/browser/webui/web_ui_data_source_unittest.cc

 // Copyright (c) 2012 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 "base/bind.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/webui/web_ui_data_source_impl.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "content/test/test_content_client.h"
@@ skipping 127 matching lines @@
   EXPECT_EQ(GetMimeType(".js"), js);
   EXPECT_EQ(GetMimeType("foo.js"), js);
   EXPECT_EQ(GetMimeType("js"), html);
   EXPECT_EQ(GetMimeType("foojs"), html);
   EXPECT_EQ(GetMimeType("foo.jsp"), html);
   EXPECT_EQ(GetMimeType("foocss"), html);
   EXPECT_EQ(GetMimeType("foo.css"), css);
   EXPECT_EQ(GetMimeType(".css.foo"), html);
 }
 
+TEST_F(WebUIDataSourceTest, QueryStringRemoval) {
+  std::string path = "path.js?query_string";
+  source()->source()->WillServiceRequest(nullptr, &path);
+  EXPECT_EQ("path.js", path);
+}
+
 }  // namespace content