Removing GL context rate limiting feature and related wrappers

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 2572cd6df23fdc743abdefbf46b397f044c33c3b..6c6735f308abb9a635bd82f4b5e51939efa748d5 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -855,30 +855,6 @@ void LayerTreeHost::ApplyScrollAndScale(ScrollAndScaleSet* info) {
   }
 }
 
-void LayerTreeHost::StartRateLimiter() {
-  if (inside_begin_main_frame_)
-    return;
-
-  if (!rate_limit_timer_.IsRunning()) {
-    rate_limit_timer_.Start(FROM_HERE,
-                            base::TimeDelta(),
-                            this,
-                            &LayerTreeHost::RateLimit);
-  }
-}
-
-void LayerTreeHost::StopRateLimiter() {
-  rate_limit_timer_.Stop();
-}
-
-void LayerTreeHost::RateLimit() {
-  // Force a no-op command on the compositor context, so that any ratelimiting
-  // commands will wait for the compositing context, and therefore for the
-  // SwapBuffers.
-  proxy_->ForceSerializeOnSwapBuffers();
-  client_->RateLimitSharedMainThreadContext();
-}
-
 void LayerTreeHost::SetDeviceScaleFactor(float device_scale_factor) {
   if (device_scale_factor == device_scale_factor_)
     return;