Do not use setDartFlags API as we're now passing flags by other means.

content/public/common/content_switches.cc

 // Copyright (c) 2012 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/public/common/content_switches.h"
 
 namespace switches {
 
 // By default, file:// URIs cannot read other file:// URIs. This is an
 // override for developers who need the old behavior for testing.
@@ skipping 15 matching lines @@
 // Causes the browser process to crash on startup.
 const char kBrowserCrashTest[]              = "crash-test";
 
 // Path to the exe to run for the renderer and plugin subprocesses.
 const char kBrowserSubprocessPath[]         = "browser-subprocess-path";
 
 // Run Chrome in Chrome Frame mode. This means that Chrome expects to be run
 // as a dependent process of the Chrome Frame plugin.
 const char kChromeFrame[]                   = "chrome-frame";
 
-// Options to pass to the Dart VM.
-const char kDartFlags[]                     = "dart-flags";
-
 // Disables client-visible 3D APIs, in particular WebGL and Pepper 3D.
 // This is controlled by policy and is kept separate from the other
 // enable/disable switches to avoid accidentally regressing the policy
 // support for controlling access to these APIs.
 const char kDisable3DAPIs[]                 = "disable-3d-apis";
 
 // Disable gpu-accelerated 2d canvas.
 const char kDisableAccelerated2dCanvas[]    = "disable-accelerated-2d-canvas";
 
 // Disables accelerated compositing.
@@ skipping 519 matching lines @@
 const char kRendererCheckFalseTest[]        = "renderer-check-false-test";
 #endif
 
 // Enable per-tile page painting.
 const char kEnablePerTilePainting[]         = "enable-per-tile-painting";
 
 // Disables the use of a 3D software rasterizer.
 const char kDisableSoftwareRasterizer[]     = "disable-software-rasterizer";
 
 }  // namespace switches