Fix spelling of "NaCl" in various places: "NaCL" is the wrong capitalisation

content/common/sandbox_mac_unittest_helper.h

Index: content/common/sandbox_mac_unittest_helper.h
diff --git a/content/common/sandbox_mac_unittest_helper.h b/content/common/sandbox_mac_unittest_helper.h
index 6ad90575a7aa2ac9c0e92d3acad97d546de59969..a3c06947759acd5219476eb90c7cb2f985005634 100644
--- a/content/common/sandbox_mac_unittest_helper.h
+++ b/content/common/sandbox_mac_unittest_helper.h
@@ -60,7 +60,7 @@ class MacSandboxTest : public base::MultiProcessTest {
   // processes.
   //
   // DANGER DANGER DANGER:
-  // Additional sandbox types defined by the embedder (e.g. the NaCL sandbox)
+  // Additional sandbox types defined by the embedder (e.g. the NaCl sandbox)
   // won't be covered by these tests.
   bool RunTestInAllSandboxTypes(const char* test_name,
                                 const char* test_data);