Bug 1384818 - flush sync log files on sync reset. r=eoger

MozReview-Commit-ID: H6CkvHGxAmx

--HG--
extra : rebase_source : 4fd55ac857c225e0a7de35f0049e873cc362b2db

services/sync/modules/policies.js

@@ -599,6 +599,7 @@ ErrorHandler.prototype = {
     Svc.Obs.add("weave:service:login:error", this);
     Svc.Obs.add("weave:service:sync:error", this);
     Svc.Obs.add("weave:service:sync:finish", this);
+    Svc.Obs.add("weave:service:start-over:finish", this);
 
     this.initLogs();
   },
@@ -716,6 +717,10 @@ ErrorHandler.prototype = {
         this.dontIgnoreErrors = false;
         this.notifyOnNextTick("weave:ui:sync:finish");
         break;
+      case "weave:service:start-over:finish":
+        // ensure we capture any logs between the last sync and the reset completing.
+        this.resetFileLog();
+        break;
     }
   },