Bug 1826529 - Show nsContentPolicyType as string in CSP log. r=freddyb

Differential Revision: https://phabricator.services.mozilla.com/D174740

dom/security/nsCSPContext.cpp

@@ -137,7 +137,8 @@ nsCSPContext::ShouldLoad(nsContentPolicyType aContentType,
   if (CSPCONTEXTLOGENABLED()) {
     CSPCONTEXTLOG(("nsCSPContext::ShouldLoad, aContentLocation: %s",
                    aContentLocation->GetSpecOrDefault().get()));
-    CSPCONTEXTLOG((">>>>                      aContentType: %d", aContentType));
+    CSPCONTEXTLOG((">>>>                      aContentType: %s",
+                   NS_CP_ContentTypeName(aContentType)));
   }
 
   // This ShouldLoad function is called from nsCSPService::ShouldLoad,