Disable a few tests that started flaking after r460581.

chrome/browser/extensions/api/web_navigation/web_navigation_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 <list>
 #include <set>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 436 matching lines @@
   url = GURL(base::StringPrintf(
       "http://www.b.com:%u/server-redirect?http://www.b.com:%u/test",
       embedded_test_server()->port(), embedded_test_server()->port()));
 
   ui_test_utils::NavigateToURL(browser(), url);
 
   ASSERT_TRUE(catcher.GetNextResult()) << catcher.message();
 }
 
 IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, ForwardBack) {
+  if (content::IsBrowserSideNavigationEnabled())
+    return; // TODO(jam): investigate
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionTest("webnavigation/forwardBack")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, IFrame) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionTest("webnavigation/iframe")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, SrcDoc) {
@@ skipping 340 matching lines @@
           "extensions/api_test/webnavigation/crash/b.html",
       embedded_test_server()->port()));
   ui_test_utils::NavigateToURL(browser(), url);
 
   ASSERT_TRUE(catcher.GetNextResult()) << catcher.message();
 }
 
 #endif
 
 }  // namespace extensions