Check for NULL pointer before assigning the test data

BUG=none
TEST=MacSandboxTest.FileAccess works when run alone


Review URL: http://codereview.chromium.org/8608005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111197 0039d316-1c4b-4281-b951-d872f2087c98

content/common/sandbox_mac_unittest_helper.h

@@ -47,7 +47,8 @@ class MacSandboxTest : public base::MultiProcessTest {
  public:
   // Runs a test specified by |test_name| in a sandbox of the type specified
   // by |sandbox_type|. |test_data| is a custom string that a test can pass
-  // to the child process runing in the sandbox.
+  // to the child process runing in the sandbox, or NULL if additional data is
+  // required.
   // Returns true if the test passes, false if either of the functions in
   // the corresponding MacSandboxTestCase return false.
   bool RunTestInSandbox(sandbox::Sandbox::SandboxProcessType sandbox_type,

content/common/sandbox_mac_unittest_helper.mm

@@ -148,7 +148,8 @@ MULTIPROCESS_TEST_MAIN(mac_sandbox_test_runner) {
     LOG(ERROR) << "Invalid sandbox test name (" << sandbox_test_name << ")";
     return -1;
   }
-  test_case->SetTestData(test_data);
+  if (test_data)
+    test_case->SetTestData(test_data);
 
   // Run Test.
   if (!test_case->BeforeSandboxInit()) {