Fixes drag of images from new tab page. We need to pass in the mime

type, otherwise webkit isn't able to get the mime type and we try and
drag an image with a bogus name.

BUG=none
TEST=drag a thumbnail from the new tab to explorer. You should end up
     with a file named foo.png.

Review URL: http://codereview.chromium.org/21435

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@9967 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 4 deletions

diff --git a/chrome/browser/dom_ui/dom_ui_contents.h b/chrome/browser/dom_ui/dom_ui_contents.h
index 58daf01..6f8bcb3 100644
--- a/chrome/browser/dom_ui/dom_ui_contents.h
+++ b/chrome/browser/dom_ui/dom_ui_contents.h
@@ -25,8 +25,9 @@ class FavIconSource : public ChromeURLDataManager::DataSource {
   virtual void StartDataRequest(const std::string& path, int request_id);
 
   virtual std::string GetMimeType(const std::string&) const {
-    // Rely on image decoder inferring the correct type.
-    return std::string();
+    // We need to explicitly return a mime type, otherwise if the user tries to
+    // drag the image they get no extension.
+    return "image/png";
   }
 
   // Called when favicon data is available from the history backend.
@@ -59,8 +60,9 @@ class ThumbnailSource : public ChromeURLDataManager::DataSource {
   virtual void StartDataRequest(const std::string& path, int request_id);
 
   virtual std::string GetMimeType(const std::string&) const {
-    // Rely on image decoder inferring the correct type.
-    return std::string();
+    // We need to explicitly return a mime type, otherwise if the user tries to
+    // drag the image they get no extension.
+    return "image/png";
   }
 
   // Called when thumbnail data is available from the history backend.