Don't allow drop to panels (pop-ups) in ChromeOS.

chrome/browser/tab_contents/tab_contents.cc

 // Copyright (c) 2010 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/browser/tab_contents/tab_contents.h"
 
 #if defined(OS_CHROMEOS)
 // For GdkScreen
 #include <gdk/gdk.h>
 #endif  // defined(OS_CHROMEOS)
@@ skipping 1352 matching lines @@
       NotificationType::METRIC_EVENT_DURATION,
       Source<TabContents>(this),
       Details<MetricEventDurationDetails>(&details));
 }
 
 void TabContents::OnCloseStarted() {
   if (tab_close_start_time_.is_null())
     tab_close_start_time_ = base::TimeTicks::Now();
 }
 
+bool TabContents::ShouldAcceptDragAndDrop() const {
+#if defined(OS_CHROMEOS)
+  // ChromeOS panels (pop-ups) do not take drag-n-drop.
+  // See http://crosbug.com/2413
+  return delegate() && !delegate()->IsPopup(const_cast<TabContents*>(this));
+#else
+  return true;
+#endif
+}
+
 TabContents* TabContents::CloneAndMakePhantom() {
   TabNavigation tab_nav;
 
   NavigationEntry* entry = controller().GetActiveEntry();
   if (extension_app_)
     tab_nav.set_virtual_url(extension_app_->GetFullLaunchURL());
   else if (entry)
     tab_nav.SetFromNavigationEntry(*entry);
 
   std::vector<TabNavigation> navigations;
@@ skipping 1810 matching lines @@
   AddInfoBar(new SavePasswordInfoBarDelegate(this, form_to_save));
 }
 
 Profile* TabContents::GetProfileForPasswordManager() {
   return profile();
 }
 
 bool TabContents::DidLastPageLoadEncounterSSLErrors() {
   return controller().ssl_manager()->ProcessedSSLErrorFromRequest();
 }