Fix the HTML5 drag and drop demos on Linux and CrOS

content/browser/web_contents/web_contents_view_aura.cc

Index: content/browser/web_contents/web_contents_view_aura.cc
diff --git a/content/browser/web_contents/web_contents_view_aura.cc b/content/browser/web_contents/web_contents_view_aura.cc
index db7b056258fd12016931be08ab10bd15306b8836..e2467e377cde2c52f343edae7f8a3b9a5f2bf709 100644
--- a/content/browser/web_contents/web_contents_view_aura.cc
+++ b/content/browser/web_contents/web_contents_view_aura.cc
@@ -373,6 +373,8 @@ void PrepareDragData(const DropData& drop_data,
   if (!drop_data.file_contents.empty())
     PrepareDragForFileContents(drop_data, provider);
 #endif
+  // We set the string before the URL because the URL also sets the string. We
+  // want to prefer a custom string over the URL string so we add it first.

[Peter Kasting, 2014/06/20 20:45:36]

This comment lies.  With your changes, SetURL() _doesn't_ set the string, at
least in this case.  How about this as a comment:

Call SetString() before SetURL() when we actually have a custom string. 
SetURL() will itself do SetString() when a string hasn't been set yet, but we
want to prefer drop_data.text.string() over the URL string if it exists.

   if (!drop_data.text.string().empty())
     provider->SetString(drop_data.text.string());
   if (drop_data.url.is_valid())