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..a89b4728ac2ce778d9de111d2d55c57f6fa5851e 100644
--- a/webkit/browser/fileapi/file_system_context.h
+++ b/webkit/browser/fileapi/file_system_context.h
@@ -188,10 +188,15 @@ class WEBKIT_STORAGE_BROWSER_EXPORT FileSystemContext
       OpenFileSystemCallback;
 
   // Used for ResolveURL.
+  enum ResolvedEntryType {
+    RESOLVED_ENTRY_FILE,
+    RESOLVED_ENTRY_DIRECTORY,
+    RESOLVED_ENTRY_NOT_FOUND,
+  };
   typedef base::Callback<void(base::File::Error result,
                               const FileSystemInfo& info,
                               const base::FilePath& file_path,
-                              bool is_directory)> ResolveURLCallback;
+                              ResolvedEntryType type)> ResolveURLCallback;
 
   // Used for DeleteFileSystem and OpenPluginPrivateFileSystem.
   typedef base::Callback<void(base::File::Error result)> StatusCallback;
@@ -208,8 +213,8 @@ 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);