cc: Abstract the LayerTreeHost.

cc/trees/latency_info_swap_promise_monitor.cc

Index: cc/trees/latency_info_swap_promise_monitor.cc
diff --git a/cc/trees/latency_info_swap_promise_monitor.cc b/cc/trees/latency_info_swap_promise_monitor.cc
index 96a6d7786e12ab86136221f1b0b19dabaed234e8..51fd32452065061ae71b7dbbc3580efbe7d24c4e 100644
--- a/cc/trees/latency_info_swap_promise_monitor.cc
+++ b/cc/trees/latency_info_swap_promise_monitor.cc
@@ -42,11 +42,10 @@ namespace cc {
 
 LatencyInfoSwapPromiseMonitor::LatencyInfoSwapPromiseMonitor(
     ui::LatencyInfo* latency,
-    LayerTreeHost* layer_tree_host,
+    LayerTreeHostInterface* layer_tree_host,
     LayerTreeHostImpl* layer_tree_host_impl)
     : SwapPromiseMonitor(layer_tree_host, layer_tree_host_impl),
-      latency_(latency) {
-}
+      latency_(latency) {}
 
 LatencyInfoSwapPromiseMonitor::~LatencyInfoSwapPromiseMonitor() {
 }