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

webkit/glue/webplugin_impl.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "webkit/glue/webplugin_impl.h"
 
 #include "Cursor.h"
 #include "Document.h"
 #include "DocumentLoader.h"
@@ skipping 643 matching lines @@
   if (!webview->delegate()) {
     return;
   }
 
   WebCore::IntRect window_rect;
   WebCore::IntRect clip_rect;
   std::vector<gfx::Rect> cutout_rects;
   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);
     move.clip_rect = webkit_glue::FromIntRect(clip_rect);
     move.cutout_rects = cutout_rects;
     move.visible = visible_;
 
     webview->delegate()->DidMove(webview, move);
   }
 
@@ skipping 747 matching lines @@
     client_index = clients_.erase(client_index);
     if (resource_client)
       resource_client->DidFail();
   }
 
   // This needs to be called now and not in the destructor since the
   // webframe_ might not be valid anymore.
   webframe_->set_plugin_delegate(NULL);
   webframe_ = NULL;
 }