content/blimp: Remove unused compositing mode switches.

blimp/engine/app/blimp_engine_config.cc

Index: blimp/engine/app/blimp_engine_config.cc
diff --git a/blimp/engine/app/blimp_engine_config.cc b/blimp/engine/app/blimp_engine_config.cc
index bdd24f0d34fede17fc6c147eae599242a3e4c9f2..f1753fc4814064255991e5b3272da98246230df0 100644
--- a/blimp/engine/app/blimp_engine_config.cc
+++ b/blimp/engine/app/blimp_engine_config.cc
@@ -41,9 +41,6 @@ void SetCommandLineDefaults(base::CommandLine* command_line) {
   // Disable use-zoom-for-dsf since it ends up overriding the device scale
   // factor reported to the client. See crbug.com/654898.
   command_line->AppendSwitchASCII(::switches::kEnableUseZoomForDSF, "false");
-
-  // Enable the updated compositing path.
-  command_line->AppendSwitch(::switches::kUseLayerTreeHostRemote);
 }
 
 BlimpEngineConfig::~BlimpEngineConfig() {}