Add a test for mime handler view iframes and make them work on Windows.

extensions/renderer/guest_view/mime_handler_view/mime_handler_view_browsertest.cc

-// Copyright 2014 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/base_paths.h"
-#include "base/files/file_util.h"
-#include "base/path_service.h"
-#include "chrome/browser/extensions/extension_apitest.h"
-#include "chrome/test/base/ui_test_utils.h"
-#include "content/public/test/browser_test_utils.h"
-#include "extensions/browser/extension_registry.h"
-#include "extensions/test/result_catcher.h"
-
-// The test extension id is set by the key value in the manifest.
-const char* kExtensionId = "oickdpebdnfbgkcaoklfcdhjniefkcji";
-
-class MimeHandlerViewTest : public ExtensionApiTest {
- public:
-  ~MimeHandlerViewTest() override {}
-
-  const extensions::Extension* LoadTestExtension() {
-    const extensions::Extension* extension = LoadExtension(
-        test_data_dir_.AppendASCII("mime_handler_view"));
-    if (!extension)
-      return nullptr;
-
-    CHECK_EQ(std::string(kExtensionId), extension->id());
-
-    return extension;
-  }
-
-  void RunTest(const std::string& path) {
-    const extensions::Extension* extension = LoadTestExtension();
-    ASSERT_TRUE(extension);
-
-    extensions::ResultCatcher catcher;
-
-    GURL extension_url("chrome-extension://" + std::string(kExtensionId) + "/" +
-                       path);
-    ui_test_utils::NavigateToURL(browser(), extension_url);
-
-    if (!catcher.GetNextResult())
-      FAIL() << catcher.message();
-  }
-};
-
-// Not working on Windows because of crbug.com/443466.
-#if defined(OS_WIN)
-#define MAYBE_PostMessage DISABLED_PostMessage
-#define MAYBE_Basic DISABLED_Basic
-#define MAYBE_Embedded DISABLED_Embedded
-#define MAYBE_Abort DISABLED_Abort
-#else
-#define MAYBE_PostMessage PostMessage
-#define MAYBE_Basic Basic
-#define MAYBE_Embedded Embedded
-#define MAYBE_Abort Abort
-#endif
-
-IN_PROC_BROWSER_TEST_F(MimeHandlerViewTest, MAYBE_PostMessage) {
-  RunTest("test_postmessage.html");
-}
-
-IN_PROC_BROWSER_TEST_F(MimeHandlerViewTest, MAYBE_Basic) {
-  RunTest("testBasic.csv");
-}
-
-IN_PROC_BROWSER_TEST_F(MimeHandlerViewTest, MAYBE_Embedded) {
-  RunTest("test_embedded.html");
-}
-
-IN_PROC_BROWSER_TEST_F(MimeHandlerViewTest, MAYBE_Abort) {
-  RunTest("testAbort.csv");
-}