Clean up Android default command line flags.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index fc63c93467dd6882340240ccf3aab6b93b1010d5..9e3e3a83a76ecd6ed4c2d3872d52dfd085489795 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -660,13 +660,6 @@ const char kMediaPlayerInRenderProcess[]    = "media-player-in-render-process";
 // Set when Chromium should use a mobile user agent.
 const char kUseMobileUserAgent[] = "use-mobile-user-agent";
 
-// Omnibus flag setting an Android graphics mode.  May be:
-//   "basic" (untiled software path)
-//   "compositor" (hardware-accelerated compositing),
-const char kGraphicsMode[]                  = "graphics-mode";
-const char kGraphicsModeValueBasic[]        = "basic";
-const char kGraphicsModeValueCompositor[]   = "compositor";
-
 // The telephony region (ISO country code) to use in phone number detection.
 const char kNetworkCountryIso[] = "network-country-iso";