content/blimp: Remove unused compositing mode switches.

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 443a5ef0a75b6b1706ca2c0c2e955252ef9cc48b..81f19ad1430a117a63464638a9eb1a6396a26c14 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -863,10 +863,6 @@ const char kContentImageTextureTarget[] = "content-image-texture-target";
 // Texture target for CHROMIUM_image backed video frame textures.
 const char kVideoImageTextureTarget[] = "video-image-texture-target";
 
-// Used in conjunction with kUseRemoteCompositing to enable the updated remote
-// compositing path using cc::LayerTreeHostRemote.
-const char kUseLayerTreeHostRemote[] = "use-layer-tree-host-remote";
-
 // Set when Chromium should use a mobile user agent.
 const char kUseMobileUserAgent[] = "use-mobile-user-agent";