PlatformAppApiTest class should not enable experimental APIs by default

chrome/browser/extensions/api/dns/dns_apitest.cc

 // Copyright (c) 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.
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/api/dns/dns_api.h"
 #include "chrome/browser/extensions/api/dns/host_resolver_wrapper.h"
 #include "chrome/browser/extensions/api/dns/mock_host_resolver_creator.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_function_test_utils.h"
+#include "chrome/common/chrome_switches.h"
 #include "net/base/mock_host_resolver.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
 
 using extension_function_test_utils::CreateEmptyExtension;
 using extension_function_test_utils::RunFunctionAndReturnSingleResult;
 
 namespace {
 
-class DnsApiTest : public PlatformAppApiTest {
+class DnsApiTest : public ExtensionApiTest {
  public:
   DnsApiTest() : resolver_event_(true, false),
                  resolver_creator_(new extensions::MockHostResolverCreator()) {
   }
 
+  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
+    ExtensionApiTest::SetUpCommandLine(command_line);
+    command_line->AppendSwitch(switches::kEnableExperimentalExtensionApis);
+  }
+
   void SetUpOnMainThread() OVERRIDE {
     extensions::HostResolverWrapper::GetInstance()->SetHostResolverForTesting(
         resolver_creator_->CreateMockHostResolver());
   }
 
   void CleanUpOnMainThread() OVERRIDE {
     extensions::HostResolverWrapper::GetInstance()->
         SetHostResolverForTesting(NULL);
     resolver_creator_->DeleteMockHostResolver();
   }
@@ skipping 53 matching lines @@
   EXPECT_EQ(net::OK, resultCode);
 
   std::string address;
   EXPECT_TRUE(value->GetString("address", &address));
   EXPECT_EQ(extensions::MockHostResolverCreator::kAddress, address);
 }
 
 IN_PROC_BROWSER_TEST_F(DnsApiTest, DnsExtension) {
   ASSERT_TRUE(RunExtensionTest("dns/api")) << message_;
 }