Only generate suggested filenames when actually dragging an image.

content/browser/web_contents/web_contents_view_aura.cc

 // Copyright (c) 2012 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 "content/browser/web_contents/web_contents_view_aura.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/auto_reset.h"
@@ skipping 138 matching lines @@
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDragSourceAura);
 };
 
 #if (!defined(OS_CHROMEOS) && defined(USE_X11)) || defined(OS_WIN)
 // Fill out the OSExchangeData with a file contents, synthesizing a name if
 // necessary.
 void PrepareDragForFileContents(const DropData& drop_data,
                                 ui::OSExchangeData::Provider* provider) {
-  base::FilePath file_name =
-      base::FilePath::FromUTF16Unsafe(drop_data.file_description_filename);
-  // Images without ALT text will only have a file extension so we need to
-  // synthesize one from the provided extension and URL.
-  if (file_name.BaseName().RemoveExtension().empty()) {
-    const base::FilePath::StringType extension = file_name.Extension();
-    // Retrieve the name from the URL.
-    file_name = net::GenerateFileName(drop_data.url, "", "", "", "", "")
-                    .ReplaceExtension(extension);
-  }
-  provider->SetFileContents(file_name, drop_data.file_contents);
+  base::Optional<base::FilePath> filename =
+      drop_data.GetSafeFilenameForImageFileContents();
+  if (filename)
+    provider->SetFileContents(*filename, drop_data.file_contents);
 }
 #endif
 
 #if defined(OS_WIN)
 void PrepareDragForDownload(
     const DropData& drop_data,
     ui::OSExchangeData::Provider* provider,
     WebContentsImpl* web_contents) {
   const GURL& page_url = web_contents->GetLastCommittedURL();
   const std::string& page_encoding = web_contents->GetEncoding();
@@ skipping 1151 matching lines @@
                                         bool allow_multiple_selection) {
   NOTIMPLEMENTED() << " show " << items.size() << " menu items";
 }
 
 void WebContentsViewAura::HidePopupMenu() {
   NOTIMPLEMENTED();
 }
 #endif
 
 }  // namespace content