Revert of Enable Site Isolation for Extensions.

chrome/browser/extensions/extension_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 "chrome/browser/extensions/extension_apitest.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/base_switches.h"
@@ skipping 138 matching lines @@
 }
 
 ExtensionApiTest::~ExtensionApiTest() {}
 
 void ExtensionApiTest::SetUpInProcessBrowserTestFixture() {
   DCHECK(!test_config_.get()) << "Previous test did not clear config state.";
   test_config_.reset(new base::DictionaryValue());
   test_config_->SetString(kTestDataDirectory,
                           net::FilePathToFileURL(test_data_dir_).spec());
   test_config_->SetInteger(kTestWebSocketPort, 0);
-  bool isolate_extensions = true;
+  bool isolate_extensions = base::CommandLine::ForCurrentProcess()->HasSwitch(
+                                switches::kSitePerProcess) ||
+                            base::CommandLine::ForCurrentProcess()->HasSwitch(
+                                extensions::switches::kIsolateExtensions);
   test_config_->SetBoolean(kIsolateExtensions, isolate_extensions);
   extensions::TestGetConfigFunction::set_test_config_state(
       test_config_.get());
 }
 
 void ExtensionApiTest::TearDownInProcessBrowserTestFixture() {
   extensions::TestGetConfigFunction::set_test_config_state(NULL);
   test_config_.reset(NULL);
 }
 
@@ skipping 261 matching lines @@
 }
 
 void ExtensionApiTest::SetUpCommandLine(base::CommandLine* command_line) {
   ExtensionBrowserTest::SetUpCommandLine(command_line);
   test_data_dir_ = test_data_dir_.AppendASCII("api_test");
   // Backgrounded renderer processes run at a lower priority, causing the
   // tests to take more time to complete. Disable backgrounding so that the
   // tests don't time out.
   command_line->AppendSwitch(switches::kDisableRendererBackgrounding);
 }