linux: make windowless plugins work again after r12179 regressed it.

webkit/glue/webplugin_impl.cc

Index: webkit/glue/webplugin_impl.cc
diff --git a/webkit/glue/webplugin_impl.cc b/webkit/glue/webplugin_impl.cc
index 308e4eaacef6332f2696d5c953f1a549d04bb683..195fb167e09588acc7dd4fd11b1cef670d2fd52a 100644
--- a/webkit/glue/webplugin_impl.cc
+++ b/webkit/glue/webplugin_impl.cc
@@ -661,14 +661,16 @@ void WebPluginImpl::setFrameRect(const WebCore::IntRect& rect,
   CalculateBounds(rect, &window_rect, &clip_rect, &cutout_rects);
 
   if (widget_dimensions_changed) {
+    // Notify the plugin that its parameters have changed.
     delegate_->UpdateGeometry(
         webkit_glue::FromIntRect(window_rect),
         webkit_glue::FromIntRect(clip_rect));
   }
 
   if (window_) {
-    // Let the WebViewDelegate know that the plugin window needs to be moved,
-    // so that all the HWNDs are moved together.
+    // Notify the window hosting the plugin (the WebViewDelegate) that
+    // it needs to adjust the plugin, so that all the HWNDs can be moved
+    // at the same time.
     WebPluginGeometry move;
     move.window = window_;
     move.window_rect = webkit_glue::FromIntRect(window_rect);