Even more test cleanup. Some fixes to non-test code.

chrome/test/webdriver/commands/navigate_commands.cc

 // Copyright (c) 2010 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/webdriver/commands/navigate_commands.h"
 
 namespace webdriver {
 
+ForwardCommand::ForwardCommand(const std::vector<std::string>& path_segments,
+                 const DictionaryValue* const parameters)
+      : WebDriverCommand(path_segments, parameters) {}
+
+ForwardCommand::~ForwardCommand() {}
+
+bool ForwardCommand::DoesPost() {
+  return true;
+}
+
 void ForwardCommand::ExecutePost(Response* const response) {
   if (!session_->GoForward()) {
     SET_WEBDRIVER_ERROR(response, "GoForward failed", kInternalServerError);
     return;
   }
 
   session_->set_current_frame_xpath("");
   response->set_status(kSuccess);
 }
 
+bool ForwardCommand::RequiresValidTab() {
+  return true;
+}
+
+BackCommand::BackCommand(const std::vector<std::string>& path_segments,
+              const DictionaryValue* const parameters)
+      : WebDriverCommand(path_segments, parameters) {}
+
+BackCommand::~BackCommand() {}
+
+bool BackCommand::DoesPost() {
+  return true;
+}
+
 void BackCommand::ExecutePost(Response* const response) {
   if (!session_->GoBack()) {
     SET_WEBDRIVER_ERROR(response, "GoBack failed", kInternalServerError);
     return;
   }
 
   session_->set_current_frame_xpath("");
   response->set_status(kSuccess);
 }
 
+bool BackCommand::RequiresValidTab() {
+  return true;
+}
+
+RefreshCommand::RefreshCommand(const std::vector<std::string>& path_segments,
+                               const DictionaryValue* const parameters)
+    : WebDriverCommand(path_segments, parameters) {}
+
+RefreshCommand::~RefreshCommand() {}
+
+bool RefreshCommand::DoesPost() {
+  return true;
+}
+
 void RefreshCommand::ExecutePost(Response* const response) {
   if (!session_->Reload()) {
     SET_WEBDRIVER_ERROR(response, "Reload failed", kInternalServerError);
     return;
   }
 
   session_->set_current_frame_xpath("");
   response->set_status(kSuccess);
 }
 
+bool RefreshCommand::RequiresValidTab() {
+  return true;
+}
+
 }  // namespace webdriver