Remove flaky marker from nacl_sandbox_test now that it is fixed.

chrome/test/nacl/nacl_sandbox_test.cc

Index: chrome/test/nacl/nacl_sandbox_test.cc
===================================================================
--- chrome/test/nacl/nacl_sandbox_test.cc	(revision 66118)
+++ chrome/test/nacl/nacl_sandbox_test.cc	(working copy)
@@ -36,8 +36,7 @@
 NaClSandboxTest::~NaClSandboxTest() {
 }
 
-// http://crbug.com/50121
-TEST_F(NaClSandboxTest, FLAKY_NaClOuterSBTest) {
+TEST_F(NaClSandboxTest, NaClOuterSBTest) {
   // Load a helloworld .nexe to trigger the nacl loader test.
   FilePath test_file(kSrpcHwHtmlFileName);
   RunTest(test_file, action_max_timeout_ms());