Rename all isolate_dependency_* to files.

chrome/tab_capture_end2end_tests.isolate

 # 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.
 {
   'includes': [
     'browser_tests.isolate',
   ],
   'conditions': [
     ['OS=="linux" or OS=="mac" or OS=="win"', {
       'variables': {
         'command': [
           '../testing/test_env.py',
           '<(PRODUCT_DIR)/browser_tests<(EXECUTABLE_SUFFIX)',
           '--test-launcher-bot-mode',
           '--enable-gpu',
           '--test-launcher-jobs=1',
           '--gtest_filter=TabCaptureApiPixelTest.EndToEnd*',
         ],
-        'isolate_dependency_untracked': [
+        'files': [
           'test/data/extensions/api_test/tab_capture/',
         ],
       },
     }],
   ],
 }