Allow extension overinstall

chrome/test/automation/automation_constants.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_TEST_AUTOMATION_AUTOMATION_CONSTANTS_H_
 #define CHROME_TEST_AUTOMATION_AUTOMATION_CONSTANTS_H_
 
 namespace automation {
 // Amount of time to wait before querying the browser.
 static const int kSleepTime = 250;
 }
 
 // Used by AutomationProxy, declared here so that other headers don't need
 // to include automation_proxy.h.
 enum AutomationLaunchResult {
   AUTOMATION_SUCCESS,
   AUTOMATION_TIMEOUT,
   AUTOMATION_VERSION_MISMATCH,
   AUTOMATION_CREATE_TAB_FAILED
 };
 
 enum AutomationMsg_NavigationResponseValues {
   AUTOMATION_MSG_NAVIGATION_ERROR = 0,
   AUTOMATION_MSG_NAVIGATION_SUCCESS,
   AUTOMATION_MSG_NAVIGATION_AUTH_NEEDED,
 };
 
 enum AutomationMsg_ExtensionResponseValues {
   AUTOMATION_MSG_EXTENSION_INSTALL_SUCCEEDED = 0,
-  AUTOMATION_MSG_EXTENSION_INSTALL_FAILED,
-  AUTOMATION_MSG_EXTENSION_ALREADY_INSTALLED,
+  AUTOMATION_MSG_EXTENSION_INSTALL_FAILED
 };
 
 // Used in the AutomationMsg_GetExtensionProperty to identify which extension
 // property should be retrieved, instead of having separate messages for each
 // property.
 enum AutomationMsg_ExtensionProperty {
   AUTOMATION_MSG_EXTENSION_ID = 0,
   AUTOMATION_MSG_EXTENSION_NAME,
   AUTOMATION_MSG_EXTENSION_VERSION,
   AUTOMATION_MSG_EXTENSION_BROWSER_ACTION_INDEX,
 };
 
 #endif  // CHROME_TEST_AUTOMATION_AUTOMATION_CONSTANTS_H_