Revert of Move gpu memory calculations to Compositor.

cc/trees/layer_tree_settings.cc

Index: cc/trees/layer_tree_settings.cc
diff --git a/cc/trees/layer_tree_settings.cc b/cc/trees/layer_tree_settings.cc
index 751b31cb1e298086644b1c1152d63226b48b037a..0524b39f4f330c6d97b74d8e6fd06a43abc924ad 100644
--- a/cc/trees/layer_tree_settings.cc
+++ b/cc/trees/layer_tree_settings.cc
@@ -69,10 +69,7 @@ LayerTreeSettings::LayerTreeSettings()
       image_decode_tasks_enabled(false),
       use_compositor_animation_timelines(false),
       wait_for_beginframe_interval(true),
-      max_staging_buffer_usage_in_bytes(32 * 1024 * 1024),
-      memory_policy_(64 * 1024 * 1024,
-                     gpu::MemoryAllocation::CUTOFF_ALLOW_EVERYTHING,
-                     ManagedMemoryPolicy::kDefaultNumResourcesLimit) {}
+      max_staging_buffer_usage_in_bytes(32 * 1024 * 1024) {}
 
 LayerTreeSettings::~LayerTreeSettings() {}