Fix regression of transparent plugins not displaying correctly.

chrome/renderer/webplugin_delegate_proxy.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 "chrome/renderer/webplugin_delegate_proxy.h"
 
 #include <algorithm>
 
 #include "app/gfx/canvas.h"
 #include "app/l10n_util.h"
@@ skipping 408 matching lines @@
   param.windowless_buffer = TransportDIB::DefaultHandleValue();
   param.background_buffer = TransportDIB::DefaultHandleValue();
 
 #if defined(OS_POSIX)
   // If we're using POSIX mmap'd TransportDIBs, sending the handle across
   // IPC establishes a new mapping rather than just sending a window ID,
   // so only do so if we've actually recreated the shared memory bitmaps.
   if (bitmaps_changed)
 #endif
   {
-    if (transport_store_.get()) {
+    if (transport_store_.get())
       param.windowless_buffer = transport_store_->handle();
-    } else if (background_store_.get()) {
+
+    if (background_store_.get())
       param.background_buffer = background_store_->handle();
-    }
   }
 
   IPC::Message* msg;
 #if defined (OS_WIN)
   std::wstring filename = StringToLowerASCII(info_.path.BaseName().value());
   if (info_.name.find(L"Windows Media Player") != std::wstring::npos) {
     // Need to update geometry synchronously with WMP, otherwise if a site
     // scripts the plugin to start playing while it's in the middle of handling
     // an update geometry message, videos don't play.  See urls in bug 20260.
     msg = new PluginMsg_UpdateGeometrySync(instance_id_, param);
@@ skipping 620 matching lines @@
     intptr_t existing_stream, bool notify_needed, intptr_t notify_data) {
   plugin_->InitiateHTTPRangeRequest(url.c_str(), range_info.c_str(),
                                     existing_stream, notify_needed,
                                     notify_data);
 }
 
 void WebPluginDelegateProxy::OnDeferResourceLoading(int resource_id,
                                                     bool defer) {
   plugin_->SetDeferResourceLoading(resource_id, defer);
 }