Bug 1318006 - Prevent "TypeError: can't access dead object" exception on webconsole getCachedMessages. r=ochameau

MozReview-Commit-ID: H0DWJ2bTyn7

--HG--
extra : rebase_source : e98eef9f9dcd47c6ef6894a6f758baee7733a952

devtools/server/actors/webconsole.js

@@ -1740,6 +1740,7 @@ WebConsoleActor.prototype =
     delete result.ID;
     delete result.innerID;
     delete result.consoleID;
+    delete result.originAttributes;
 
     result.arguments = Array.map(aMessage.arguments || [], (aObj) => {
       let dbgObj = this.makeDebuggeeValue(aObj, aUseObjectGlobal);