Make using virtual contexts a workaround flag rather than cmdline

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_
 
 #include "build/build_config.h"
@@ skipping 136 matching lines @@
 extern const char kEnableSpatialNavigation[];
 CONTENT_EXPORT extern const char kEnableSpeechSynthesis[];
 extern const char kEnableSSLCachedInfo[];
 CONTENT_EXPORT extern const char kEnableStatsTable[];
 extern const char kEnableStrictSiteIsolation[];
 CONTENT_EXPORT extern const char kEnableTcpFastOpen[];
 CONTENT_EXPORT extern const char kEnableTextServicesFramework[];
 CONTENT_EXPORT extern const char kEnableThreadedCompositing[];
 extern const char kEnableUserMediaScreenCapturing[];
 extern const char kEnableViewport[];
-extern const char kEnableVirtualGLContexts[];
 extern const char kEnableVisualWordMovement[];
 CONTENT_EXPORT extern const char kEnableVtune[];
 extern const char kEnableWebAnimationsCSS[];
 extern const char kEnableWebAnimationsSVG[];
 CONTENT_EXPORT extern const char kEnableWebGLDraftExtensions[];
 extern const char kEnableWebMIDI[];
 extern const char kEnableWebRtcTcpServerSocket[];
 CONTENT_EXPORT extern const char kExtraPluginDir[];
 CONTENT_EXPORT extern const char kForceCompositingMode[];
 extern const char kForceFieldTrials[];
@@ skipping 117 matching lines @@
 #if defined(USE_AURA)
 CONTENT_EXPORT extern const char kTestCompositor[];
 #endif
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_