Let input tag filter out non-native files in dropped data.

Source/core/page/DragData.cpp

Index: Source/core/page/DragData.cpp
diff --git a/Source/core/page/DragData.cpp b/Source/core/page/DragData.cpp
index 6e7e29a73f32ddcc0943bb8d8b47348255ec504f..fbb264c22eaeb2a5eb6a4ef0999c8476278de067 100644
--- a/Source/core/page/DragData.cpp
+++ b/Source/core/page/DragData.cpp
@@ -85,21 +85,18 @@ bool DragData::containsFiles() const
     return m_platformDragData->containsFilenames();
 }
 
-unsigned DragData::numberOfFiles() const
-{
-    return m_platformDragData->filenames().size();
-}
-
 int DragData::modifierKeyState() const
 {
     return m_platformDragData->modifierKeyState();
 }
 
-void DragData::asFilenames(Vector<String>& result) const
+void DragData::asFilePaths(Vector<String>& result) const
 {
     const Vector<String>& filenames = m_platformDragData->filenames();
-    for (size_t i = 0; i < filenames.size(); ++i)
-        result.append(filenames[i]);
+    for (size_t i = 0; i < filenames.size(); ++i) {
+        if (!filenames[i].isEmpty())
+            result.append(filenames[i]);
+    }
 }
 
 bool DragData::containsPlainText() const