DevTools: set autoreveal files in navigator setting to true by default

BUG=556508

Review-Url: https://codereview.chromium.org/2304863003
Cr-Commit-Position: refs/heads/master@{#417047}

third_party/WebKit/Source/devtools/front_end/sources/module.json

@@ -302,7 +302,7 @@
             "title": "Automatically reveal files in navigator",
             "settingName": "autoRevealInNavigator",
             "settingType": "boolean",
-            "defaultValue": false
+            "defaultValue": true
         },
         {
             "type": "setting",