Remove thread restriction of fileapi::FileSystemContext::ResolveURL.

webkit/browser/fileapi/file_system_context.h

Index: webkit/browser/fileapi/file_system_context.h
diff --git a/webkit/browser/fileapi/file_system_context.h b/webkit/browser/fileapi/file_system_context.h
index ba91af7ef97b9510c00018581b385c2a5988d990..74e3b983d0d6d11b06c2086c50f0c632a1556d0c 100644
--- a/webkit/browser/fileapi/file_system_context.h
+++ b/webkit/browser/fileapi/file_system_context.h
@@ -208,8 +208,8 @@ class WEBKIT_STORAGE_BROWSER_EXPORT FileSystemContext
       const OpenFileSystemCallback& callback);
 
   // Opens the filesystem for the given |url| as read-only, and then checks the
-  // existence of the file entry referred by the URL. This should be called on
-  // the IO thread.
+  // existence of the file entry referred by the URL. Can be called from any
+  // thread with a message loop. |callback| is invoked on the caller thread.
   void ResolveURL(
       const FileSystemURL& url,
       const ResolveURLCallback& callback);