Kill wait_until support, which is unused once ClickElementAction is

tools/telemetry/telemetry/page/actions/wait_until.py

Index: tools/telemetry/telemetry/page/actions/wait_until.py
diff --git a/tools/telemetry/telemetry/page/actions/wait_until.py b/tools/telemetry/telemetry/page/actions/wait_until.py
deleted file mode 100644
index e7ce56120c9560fa5b14378fdbec127616e2acb5..0000000000000000000000000000000000000000
--- a/tools/telemetry/telemetry/page/actions/wait_until.py
+++ /dev/null
@@ -1,21 +0,0 @@
-# Copyright 2014 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-class WaitUntil(object):
-
-  def __init__(self, previous_action, attributes=None):
-    assert previous_action is not None, 'wait_until must have a previous action'
-    self.timeout = 60
-    if attributes:
-      for k, v in attributes.iteritems():
-        setattr(self, k, v)
-    self._previous_action = previous_action
-
-  def RunActionAndWait(self, tab):
-    if getattr(self, 'condition', None) == 'href_change':
-      self._previous_action.WillRunAction(tab)
-      old_url = tab.EvaluateJavaScript('document.location.href')
-      self._previous_action.RunAction(tab)
-      tab.WaitForJavaScriptExpression(
-          'document.location.href != "%s"' % old_url, self.timeout)