Revert of Enable Site Isolation for Extensions.

extensions/browser/guest_view/web_view/web_view_apitest.cc

 // Copyright 2014 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 "extensions/browser/guest_view/web_view/web_view_apitest.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/macros.h"
@@ skipping 175 matching lines @@
   AppShellTest::SetUpCommandLine(command_line);
   command_line->AppendSwitchASCII(::switches::kJavaScriptFlags, "--expose-gc");
 }
 
 void WebViewAPITest::SetUpOnMainThread() {
   AppShellTest::SetUpOnMainThread();
 
   TestGetConfigFunction::set_test_config_state(&test_config_);
   base::FilePath test_data_dir;
   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);
 }
 
 void WebViewAPITest::StartTestServer() {
   // For serving guest pages.
   if (!embedded_test_server()->Start()) {
     LOG(ERROR) << "Failed to start test server.";
     return;
   }
 
@@ skipping 524 matching lines @@
 // This test verifies that webview.contentWindow works inside an iframe
 IN_PROC_BROWSER_TEST_F(WebViewAPITest, TestWebViewInsideFrame) {
   LaunchApp("web_view/inside_iframe");
 }
 
 IN_PROC_BROWSER_TEST_F(WebViewAPITest, TestCaptureVisibleRegion) {
   RunTest("testCaptureVisibleRegion", "web_view/apitest");
 }
 
 }  // namespace extensions