Back out r58711. It appears to have caused video/media-related ui_tests...

chrome/common/chrome_switches.h

Index: chrome/common/chrome_switches.h
===================================================================
--- chrome/common/chrome_switches.h	(revision 58729)
+++ chrome/common/chrome_switches.h	(working copy)
@@ -47,7 +47,6 @@
 extern const char kCountry[];
 extern const char kDebugPrint[];
 extern const char kDiagnostics[];
-extern const char kDisableAcceleratedCompositing[];
 extern const char kDisableAltWinstation[];
 extern const char kDisableApplicationCache[];
 extern const char kDisableApps[];
@@ -63,7 +62,6 @@
 extern const char kDisableDesktopNotifications[];
 extern const char kDisableDevTools[];
 extern const char kDisableDeviceOrientation[];
-extern const char kDisableExperimentalWebGL[];
 extern const char kDisableExtensions[];
 extern const char kDisableExtensionsFileAccessCheck[];
 extern const char kDisableGeolocation[];
@@ -125,6 +123,7 @@
 extern const char kEnableDeviceMotion[];
 extern const char kEnableDNSSECCerts[];
 extern const char kEnableExperimentalExtensionApis[];
+extern const char kEnableExperimentalWebGL[];
 extern const char kEnableExtensionTimelineApi[];
 extern const char kEnableFastback[];
 extern const char kEnableFileCookies[];