remove unused kDisableMediaHistoryLogging flags

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 255 matching lines @@
 CONTENT_EXPORT extern const char kDisableWebRtcHWDecoding[];
 CONTENT_EXPORT extern const char kDisableWebRtcEncryption[];
 CONTENT_EXPORT extern const char kDisableWebRtcHWEncoding[];
 extern const char kEnableWebRtcTcpServerSocket[];
 CONTENT_EXPORT extern const char kEnableWebRtcHWVp8Encoding[];
 #endif
 
 #if defined(OS_ANDROID)
 CONTENT_EXPORT extern const char kDisableGestureRequirementForMediaFullscreen[];
 CONTENT_EXPORT extern const char kDisableGestureRequirementForMediaPlayback[];
-extern const char kDisableMediaHistoryLogging[];
 CONTENT_EXPORT extern const char kDisableClickDelay[];
 CONTENT_EXPORT extern const char kDisableOverscrollEdgeEffect[];
 CONTENT_EXPORT extern const char kDisableWebRTC[];
 CONTENT_EXPORT extern const char kEnableSpeechRecognition[];
 CONTENT_EXPORT extern const char kForceUseOverlayEmbeddedVideo[];
 CONTENT_EXPORT extern const char kHideScrollbars[];
 extern const char kNetworkCountryIso[];
 CONTENT_EXPORT extern const char kRemoteDebuggingSocketName[];
 #endif
 
 CONTENT_EXPORT extern const char kDisableWebAudio[];
 
 #if defined(OS_CHROMEOS)
 CONTENT_EXPORT extern const char kDisablePanelFitting[];
 #endif
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
 extern const char kEnableCarbonInterposing[];
 extern const char kDisableCoreAnimationPlugins[];
 #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_