Fix the array format for the gcl diff with no change list case.

TBR=nsylvain

Review URL: http://codereview.chromium.org/2475004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@48755 0039d316-1c4b-4281-b951-d872f2087c98

gcl.py

@@ -1165,7 +1165,7 @@ def CMDdiff(args):
     change_info = ChangeInfo.Load(args.pop(0), GetRepositoryRoot(), True, True)
     files = change_info.GetFileNames()
   else:
-    files = GetFilesNotInCL()
+    files = [f[1] for f in GetFilesNotInCL()]
 
   root = GetRepositoryRoot()
   cmd = ['svn', 'diff']