Fix omnibox height when less than 64 pixels tall.

ui/aura/window_tree_host.cc

Index: ui/aura/window_tree_host.cc
diff --git a/ui/aura/window_tree_host.cc b/ui/aura/window_tree_host.cc
index 4deb5fcd2fd3b990ce6a26eaf65a0e78decb02cb..7b45902646d76c33e8bfebc83b7a001ad109e0c8 100644
--- a/ui/aura/window_tree_host.cc
+++ b/ui/aura/window_tree_host.cc
@@ -181,10 +181,11 @@ void WindowTreeHost::NotifyHostResized(const gfx::Size& new_size) {
   compositor_->SetScaleAndSize(GetDeviceScaleFactorFromDisplay(window()),
                                new_size);
 
+  gfx::Size layer_size = GetBounds().size();
   // The layer, and the observers should be notified of the
   // transformed size of the root window.
-  UpdateRootWindowSize(new_size);
-  delegate_->OnHostResized(new_size);
+  UpdateRootWindowSize(layer_size);
+  delegate_->OnHostResized(layer_size);
 }
 
 #if defined(OS_ANDROID)