Disable PluginTest.GetURL on Mac since it's failing even with retries sometimes.

BUG=402164
TBR=avi@chromium.org

Review URL: https://codereview.chromium.org/453153002

Cr-Commit-Position: refs/heads/master@{#288448}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288448 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/plugin_browsertest.cc

@@ -222,10 +222,12 @@ IN_PROC_BROWSER_TEST_F(PluginTest, MAYBE(ManyPlugins)) {
   LoadAndWait(GetURL("many_plugins.html"));
 }
 
+#if !defined(OS_MACOSX)  // http://crbug.com/402164
 // Test various calls to GetURL from a plugin.
 IN_PROC_BROWSER_TEST_F(PluginTest, MAYBE(GetURL)) {
   LoadAndWait(GetURL("geturl.html"));
 }
+#endif
 
 // Test various calls to GetURL for javascript URLs with
 // non NULL targets from a plugin.