Kill wait_until support, which is unused once ClickElementAction is

tools/telemetry/telemetry/page/actions/page_action.py

Index: tools/telemetry/telemetry/page/actions/page_action.py
diff --git a/tools/telemetry/telemetry/page/actions/page_action.py b/tools/telemetry/telemetry/page/actions/page_action.py
index b30f575161e86e6896db959ae44e46a053af77f4..14f193ec4055d2c41cdcc19e00aecdf2f8bdbd54 100644
--- a/tools/telemetry/telemetry/page/actions/page_action.py
+++ b/tools/telemetry/telemetry/page/actions/page_action.py
@@ -1,7 +1,6 @@
 # Copyright 2012 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.
-from telemetry.page.actions import wait_until
 
 class PageActionNotSupported(Exception):
   pass
@@ -17,25 +16,12 @@ class PageAction(object):
     if attributes:
       for k, v in attributes.iteritems():
         setattr(self, k, v)
-    if hasattr(self, 'wait_until'):
-      self.wait_until = wait_until.WaitUntil(self, self.wait_until)
-    else:
-      self.wait_until = None
 
   def WillRunAction(self, tab):
     """Override to do action-specific setup before
     Test.WillRunAction is called."""
     pass
 
-  def WillWaitAfterRun(self):
-    return self.wait_until is not None
-
-  def RunActionAndMaybeWait(self, tab):
-    if self.wait_until:
-      self.wait_until.RunActionAndWait(tab)
-    else:
-      self.RunAction(tab)
-
   def RunAction(self, tab):
     raise NotImplementedError()