Bug 1255266 - create sandbox with system principal. r=jryans,khuey.

MozReview-Commit-ID: LZRA24MRp1K

--HG--
extra : rebase_source : 3cb57e131321848da764e26b3741443f91acb003

devtools/shared/Loader.jsm

@@ -62,18 +62,28 @@ XPCOMUtils.defineLazyGetter(loaderModules, "xpcInspector", () => {
 XPCOMUtils.defineLazyGetter(loaderModules, "indexedDB", () => {
   // On xpcshell, we can't instantiate indexedDB without crashing
   try {
-    return Cu.Sandbox(this, {wantGlobalProperties:["indexedDB"]}).indexedDB;
+    let sandbox
+      = Cu.Sandbox(CC('@mozilla.org/systemprincipal;1', 'nsIPrincipal')(),
+                   {wantGlobalProperties: ["indexedDB"]});
+    return sandbox.indexedDB;
+
   } catch(e) {
     return {};
   }
 });
 
 XPCOMUtils.defineLazyGetter(loaderModules, "CSS", () => {
-  return Cu.Sandbox(this, {wantGlobalProperties: ["CSS"]}).CSS;
+  let sandbox
+    = Cu.Sandbox(CC('@mozilla.org/systemprincipal;1', 'nsIPrincipal')(),
+                 {wantGlobalProperties: ["CSS"]});
+  return sandbox.CSS;
 });
 
 XPCOMUtils.defineLazyGetter(loaderModules, "URL", () => {
-  return Cu.Sandbox(this, {wantGlobalProperties: ["URL"]}).URL;
+  let sandbox
+    = Cu.Sandbox(CC('@mozilla.org/systemprincipal;1', 'nsIPrincipal')(),
+                 {wantGlobalProperties: ["URL"]});
+  return sandbox.URL;
 });
 
 var sharedGlobalBlocklist = ["sdk/indexed-db"];