Make kExposeInternalsForTesting usable (again) for interactive content_shell.

content/shell/common/layout_test/layout_test_switches.cc

 // Copyright 2016 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 "content/shell/common/layout_test/layout_test_switches.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_split.h"
 
 namespace switches {
@@ skipping 17 matching lines @@
 // Always use the complex text path for layout tests.
 const char kAlwaysUseComplexText[] = "always-use-complex-text";
 
 // Enables the leak detection of loading webpages. This allows us to check
 // whether or not reloading a webpage releases web-related objects correctly.
 const char kEnableLeakDetection[] = "enable-leak-detection";
 
 // Encode binary layout test results (images, audio) using base64.
 const char kEncodeBinary[] = "encode-binary";
 
-// Exposes the window.internals object to JavaScript for interactive development
-// and debugging of layout tests that rely on it.
-const char kExposeInternalsForTesting[] = "expose-internals-for-testing";
-
 // Request the render trees of pages to be dumped as text once they have
 // finished loading.
 const char kRunLayoutTest[] = "run-layout-test";
 
 // This makes us disable some web-platform runtime features so that we test
 // content_shell as if it was a stable release. It is only followed when
 // kRunLayoutTest is set. For the features' level, see
 // http://dev.chromium.org/blink/runtime-enabled-features.
 const char kStableReleaseMode[] = "stable-release-mode";
 
 }  // namespace switches