Disable MediaFileValidatorTest.UnsupportedExtension

chrome/browser/media_galleries/fileapi/media_file_validator_browsertest.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 <stddef.h>
 #include <stdint.h>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
@@ skipping 235 matching lines @@
   int test_file_size_;
 
   storage::FileSystemURL move_src_;
   storage::FileSystemURL move_dest_;
 
   scoped_refptr<content::MessageLoopRunner> loop_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaFileValidatorTest);
 };
 
-IN_PROC_BROWSER_TEST_F(MediaFileValidatorTest, UnsupportedExtension) {
+// Flaky on linux_chromium_rel_ng. https://crbug.com/704614.
+#if defined(OS_LINUX)
+#define MAYBE_UnsupportedExtension DISABLED_UnsupportedExtension
+#else
+#define MAYBE_UnsupportedExtension UnsupportedExtension
+#endif
+IN_PROC_BROWSER_TEST_F(MediaFileValidatorTest, MAYBE_UnsupportedExtension) {
   MoveTest("a.txt", std::string(kValidImage, arraysize(kValidImage)), false);
 }
 
 IN_PROC_BROWSER_TEST_F(MediaFileValidatorTest, ValidImage) {
   MoveTest("a.webp", std::string(kValidImage, arraysize(kValidImage)), true);
 }
 
 IN_PROC_BROWSER_TEST_F(MediaFileValidatorTest, InvalidImage) {
   MoveTest("a.webp", std::string(kInvalidMediaFile,
            arraysize(kInvalidMediaFile)), false);
@@ skipping 17 matching lines @@
   test_file = test_file.AppendASCII("no_streams.webm");
   MoveTestFromFile("no_streams.webm", test_file, false);
 }
 
 IN_PROC_BROWSER_TEST_F(MediaFileValidatorTest, ValidVideo) {
   base::FilePath test_file = GetMediaTestDir();
   ASSERT_FALSE(test_file.empty());
   test_file = test_file.AppendASCII("bear-320x240-multitrack.webm");
   MoveTestFromFile("multitrack.webm", test_file, true);
 }