Bug 1035557 - Migrate crash checkpoints with the session so that we don't appear to crash during reset. r=ttaubert

--HG--
extra : rebase_source : 29fd4cccaf53a4011d8022b733e83eb1d7f25aaf
extra : histedit_source : c0bb058cd59087c126e2462d596f6b72db9d0de1

browser/components/migration/FirefoxProfileMigrator.js

@@ -87,12 +87,14 @@ FirefoxProfileMigrator.prototype.getResources = function() {
     [PlacesBackups.profileRelativeFolderPath]);
   let dictionary = getFileResource(types.OTHERDATA, ["persdict.dat"]);
 
+  let sessionCheckpoints = this._getFileObject(sourceProfileDir, "sessionCheckpoints.json");
   let sessionFile = this._getFileObject(sourceProfileDir, "sessionstore.js");
   let session;
   if (sessionFile) {
     session = {
       type: types.SESSION,
       migrate: function(aCallback) {
+        sessionCheckpoints.copyTo(currentProfileDir, "sessionCheckpoints.json");
         let newSessionFile = currentProfileDir.clone();
         newSessionFile.append("sessionstore.js");
         let migrationPromise = SessionMigration.migrate(sessionFile.path, newSessionFile.path);