Fixing browser crash in the linux tab dragging code.

BUG=106772
TEST=NONE


Review URL: http://codereview.chromium.org/8918021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@114144 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/gtk/tabs/drag_data.cc

@@ -98,7 +98,8 @@ TabContentsWrapper* DragData::GetSourceTabContentsWrapper() {
 }
 
 TabContents* DragData::GetSourceTabContents() {
-  return GetSourceTabData()->contents_->tab_contents();
+  TabContentsWrapper* contents = GetSourceTabData()->contents_;
+  return contents ? contents->tab_contents(): NULL;
 }
 
 DraggedTabData* DragData::GetSourceTabData() {

chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.cc

@@ -86,7 +86,8 @@ void DraggedTabControllerGtk::CaptureDragInfo(const gfx::Point& mouse_offset) {
 
 void DraggedTabControllerGtk::Drag() {
   if (!drag_data_->GetSourceTabData()->tab_ ||
-      !drag_data_->GetSourceTabContentsWrapper()) {
+      !drag_data_->GetSourceTabContentsWrapper() ||
+      !drag_data_->GetSourceTabContents()) {
     return;
   }