Disable WebNavigationApiTest.ServerRedirect which is flaky on more than Linux.

chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc

Index: chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
diff --git a/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc b/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
index eea35bf5c924c06f0a235e7a6965a008412c77bc..aaa3df605dcc49e5254961c7a814666121f6c343 100644
--- a/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
+++ b/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
@@ -399,12 +399,8 @@ IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, ClientRedirect) {
       << message_;
 }
 
-#if defined(OS_LINUX)  // http://crbug.com/660288
-#define MAYBE_ServerRedirect DISABLED_ServerRedirect
-#else
-#define MAYBE_ServerRedirect ServerRedirect
-#endif
-IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, MAYBE_ServerRedirect) {
+// http://crbug.com/660288
+IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, DISABLED_ServerRedirect) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionTest("webnavigation/serverRedirect"))
       << message_;