Modify WebView drop effect override values.

webkit/glue/webview_impl.h

 // Copyright (c) 2009 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.
 
 #ifndef WEBKIT_GLUE_WEBVIEW_IMPL_H_
 #define WEBKIT_GLUE_WEBVIEW_IMPL_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 313 matching lines @@
 
   // True while dispatching system drag and drop events to drag/drop targets
   // within this WebView.
   bool drag_target_dispatch_;
 
   // Valid when drag_target_dispatch_ is true; the identity of the drag data
   // copied from the WebDropData object sent from the browser process.
   int32 drag_identity_;
 
   // Valid when drag_target_dispatch_ is true.  Used to override the default
-  // browser drop effect with the effects "copy" or "none".
+  // browser drop effect with the effects "none" or "copy".
   enum DragTargetDropEffect {
-    DROP_EFFECT_DEFAULT = 0,
-    DROP_EFFECT_COPY,
-    DROP_EFFECT_NONE
+    DROP_EFFECT_DEFAULT = -1,
+    DROP_EFFECT_NONE,
+    DROP_EFFECT_COPY
   } drop_effect_;
 
   // When true, the drag data can be dropped onto the current drop target in
   // this WebView (the drop target can accept the drop).
   bool drop_accept_;
 
   // The autocomplete popup.  Kept around and reused every-time new suggestions
   // should be shown.
   RefPtr<WebCore::PopupContainer> autocomplete_popup_;
 
@@ skipping 15 matching lines @@
   static const WebKit::WebInputEvent* current_input_event() {
     return g_current_input_event;
   }
 private:
   static const WebKit::WebInputEvent* g_current_input_event;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewImpl);
 };
 
 #endif  // WEBKIT_GLUE_WEBVIEW_IMPL_H_