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

content/public/common/content_switches.h

 // 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.
 
 // Defines all the "content" command-line switches.
 
 #ifndef CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_
 #define CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_
 #pragma once
 
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 
 namespace switches {
 
 CONTENT_EXPORT extern const char kAllowFileAccessFromFiles[];
 extern const char kAllowSandboxDebugging[];
 extern const char kAuditHandles[];
 extern const char kAuditAllHandles[];
 CONTENT_EXPORT extern const char kBrowserAssertTest[];
 CONTENT_EXPORT extern const char kBrowserCrashTest[];
 CONTENT_EXPORT extern const char kBrowserSubprocessPath[];
 // TODO(jam): this doesn't belong in content.
 CONTENT_EXPORT extern const char kChromeFrame[];
-extern const char kDartFlags[];
 CONTENT_EXPORT extern const char kDisable3DAPIs[];
 CONTENT_EXPORT extern const char kDisableAccelerated2dCanvas[];
 CONTENT_EXPORT extern const char kDisableAcceleratedCompositing[];
 CONTENT_EXPORT extern const char kDisableAcceleratedLayers[];
 CONTENT_EXPORT extern const char kDisableAcceleratedPlugins[];
 CONTENT_EXPORT extern const char kDisableAcceleratedVideo[];
 CONTENT_EXPORT extern const char kDisableAltWinstation[];
 CONTENT_EXPORT extern const char kDisableApplicationCache[];
 extern const char kDisableAudio[];
 extern const char kDisableBackingStoreLimit[];
@@ skipping 147 matching lines @@
 
 #if !defined(OFFICIAL_BUILD)
 CONTENT_EXPORT extern const char kRendererCheckFalseTest[];
 #endif
 
 extern const char kEnablePerTilePainting[];
 
 }  // namespace switches
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_