Issue #2241 - Part 4.3: Move devtools over to getBounds().

This leaves getAdjustedQuads alone because it lives in its own world and its
result gets sent over IPC. That leaves things in a bit of an intermediate state,
but that should be OK for now.

Backported from Mozilla bug 1186265.

devtools/server/actors/inspector.js

@@ -3071,7 +3071,10 @@ function nodeHasSize(node) {
   }
 
   let quads = node.getBoxQuads();
-  return quads.length && quads.some(quad => quad.bounds.width && quad.bounds.height);
+  return quads.some(quad => {
+    let bounds = quad.getBounds();
+    return bounds.width && bounds.height;
+  });
 }
 
 /**