Remove the remaining parts of ignorePendingStylesheets and placeholder styles.

sky/engine/core/events/MouseRelatedEvent.cpp

Index: sky/engine/core/events/MouseRelatedEvent.cpp
diff --git a/sky/engine/core/events/MouseRelatedEvent.cpp b/sky/engine/core/events/MouseRelatedEvent.cpp
index 4bbbf2a891e0692bb6ffee5bfe2bc6557f717f2c..64d2f4444e6c6194a2ced829ea34896ced9d9417 100644
--- a/sky/engine/core/events/MouseRelatedEvent.cpp
+++ b/sky/engine/core/events/MouseRelatedEvent.cpp
@@ -108,7 +108,7 @@ void MouseRelatedEvent::computeRelativePosition()
     m_offsetLocation = m_pageLocation;
 
     // Must have an updated render tree for this math to work correctly.
-    targetNode->document().updateLayoutIgnorePendingStylesheets();
+    targetNode->document().updateLayout();
 
     // Adjust offsetLocation to be relative to the target's position.
     if (RenderObject* r = targetNode->renderer()) {