Remove 'read_only': 1 from most .isolate files.

testing/chromoting/chromoting_integration_tests.isolate

 # Copyright (c) 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.
 {
   'conditions': [
     ['OS=="linux"', {
       'variables': {
         'command': [
           './browser_tests_launcher.py',
           '--commands_file',
@@ skipping 37 matching lines @@
       'variables': {
         'files': [
           '../test_env.py',
           '<(PRODUCT_DIR)/browser_tests<(EXECUTABLE_SUFFIX)',
           '<(PRODUCT_DIR)/remoting/remoting.webapp/',
           '<(PRODUCT_DIR)/remoting/remoting.webapp.v2/',
           '<(PRODUCT_DIR)/remoting/browser_test_resources/',
           '<(PRODUCT_DIR)/resources.pak',
           '../../remoting/tools/internal/test_accounts.json',
         ],
-        'read_only': 1,
       },
     }],
     ['OS=="linux" or OS=="win"', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/chrome_100_percent.pak',
           '<(PRODUCT_DIR)/locales/en-US.pak',
         ],
       },
     }],
@@ skipping 49 matching lines @@
           '<(PRODUCT_DIR)/kasko.dll',
         ],
       },
     }],
   ],
   'includes': [
     '../../base/base.isolate',
     '../../gin/v8.isolate',
   ],
 }