Don't abort drags if drag image generation fails.

Source/core/page/DragController.cpp

Index: Source/core/page/DragController.cpp
diff --git a/Source/core/page/DragController.cpp b/Source/core/page/DragController.cpp
index e2abec2cb4433aa3dce4322003178ae84b36be2d..9922972e925b2faf9ce06daf72a423bef758ea09 100644
--- a/Source/core/page/DragController.cpp
+++ b/Source/core/page/DragController.cpp
@@ -931,8 +931,6 @@ bool DragController::startDrag(LocalFrame* src, const DragState& state, const Pl
         }
         doSystemDrag(dragImage.get(), dragLocation, mouseDraggedPoint, dataTransfer, src, true);
     } else if (state.m_dragType == DragSourceActionDHTML) {
-        if (!dragImage)
-            return false;
         doSystemDrag(dragImage.get(), dragLocation, dragOrigin, dataTransfer, src, false);
     } else {
         ASSERT_NOT_REACHED();