Bug 1256468 - sessionHistory shim should QI DocShell to nsIWebNavigation automatically. r=krizsa

MozReview-Commit-ID: 8benvQvcfLO

--HG--
extra : rebase_source : 37abd37a9ae0a0390a2178661271ffd756fe9a11

toolkit/components/addoncompat/RemoteAddonsParent.jsm

@@ -863,7 +863,7 @@ function getSessionHistory(browser) {
     // We may not have any messages from this tab yet.
     return null;
   }
-  return remoteChromeGlobal.docShell.sessionHistory;
+  return remoteChromeGlobal.docShell.QueryInterface(Ci.nsIWebNavigation).sessionHistory;
 }
 
 RemoteBrowserElementInterposition.getters.contentDocument = function(addon, target) {

toolkit/components/addoncompat/tests/addon/bootstrap.js

@@ -61,6 +61,7 @@ function testContentWindow()
       ok(browser.contentWindow, "contentWindow is defined");
       ok(browser.contentDocument, "contentWindow is defined");
       is(gWin.content, browser.contentWindow, "content === contentWindow");
+      ok(browser.webNavigation.sessionHistory, "sessionHistory is defined");
 
       ok(browser.contentDocument.getElementById("link"), "link present in document");