Reenable ExtensionWebRequestApiTest.WebRequestBlocking after fixing the flakyness

BUG=91715
TEST=no


Review URL: http://codereview.chromium.org/8633011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111231 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/extensions/extension_webrequest_apitest.cc

@@ -89,9 +89,8 @@ IN_PROC_BROWSER_TEST_F(ExtensionWebRequestApiTest, WebRequestAuthRequired) {
       message_;
 }
 
-// Hangs flakily: http://crbug.com/91715
 IN_PROC_BROWSER_TEST_F(ExtensionWebRequestApiTest,
-                       DISABLED_WebRequestBlocking) {
+                       WebRequestBlocking) {
   CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kEnableExperimentalExtensionApis);