Bug 1331115 - Fix two typos in CPOW code. r=billm

MozReview-Commit-ID: FAh7O1U9hGP

js/ipc/JavaScriptParent.cpp

@@ -165,7 +165,7 @@ JavaScriptParent::trace(JSTracer* trc)
 JSObject*
 JavaScriptParent::scopeForTargetObjects()
 {
-    // CPWOWs from the child need to point into the parent's unprivileged junk
+    // CPOWs from the child need to point into the parent's unprivileged junk
     // scope so that a compromised child cannot compromise the parent. In
     // practice, this means that a child process can only (a) hold parent
     // objects alive and (b) invoke them if they are callable.