[chromedriver] Implement DELETE NetworkConditions

chrome/test/chromedriver/window_commands.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/test/chromedriver/window_commands.h"
 
 #include <list>
 #include <string>
 
 #include "base/callback.h"
@@ skipping 912 matching lines @@
                   "either 'network_conditions' or 'network_name' must be "
                   "supplied");
   }
 
   session->overridden_network_conditions.reset(
       network_conditions.release());
   return web_view->OverrideNetworkConditions(
       *session->overridden_network_conditions);
 }
 
+Status ExecuteDeleteNetworkConditions(
+    Session* session,
+    WebView* web_view,
+    const base::DictionaryValue& params,
+    scoped_ptr<base::Value>* value) {
+  // Chrome does not have any command to stop overriding network conditions, so
+  // we just override the network conditions with the "No throttling" preset.
+  NetworkConditions network_conditions;
+  // Get conditions from preset list.
+  Status status = FindPresetNetwork("No throttling", &network_conditions);
+  if (status.IsError())
+    return status;
+
+  status = web_view->OverrideNetworkConditions(network_conditions);
+  if (status.IsError())
+    return status;
+
+  // After we've successfully overridden the network conditions with
+  // "No throttling", we can delete them from |session|.
+  session->overridden_network_conditions.reset();
+  return status;
+}
+
 Status ExecuteTakeHeapSnapshot(
     Session* session,
     WebView* web_view,
     const base::DictionaryValue& params,
     scoped_ptr<base::Value>* value) {
   return web_view->TakeHeapSnapshot(value);
 }