DevTools: [Persistence] sync resetting of working copy

third_party/WebKit/Source/devtools/front_end/persistence/Persistence.js

Index: third_party/WebKit/Source/devtools/front_end/persistence/Persistence.js
diff --git a/third_party/WebKit/Source/devtools/front_end/persistence/Persistence.js b/third_party/WebKit/Source/devtools/front_end/persistence/Persistence.js
index d22a345776ca9a6fa31024670452ecdc51bef5ad..8ecf83d5bcbaa8e205c2249b067f278813c19941 100644
--- a/third_party/WebKit/Source/devtools/front_end/persistence/Persistence.js
+++ b/third_party/WebKit/Source/devtools/front_end/persistence/Persistence.js
@@ -135,6 +135,14 @@ Persistence.Persistence = class extends Common.Object {
     if (!binding || binding[Persistence.Persistence._muteWorkingCopy])
       return;
     var other = binding.network === uiSourceCode ? binding.fileSystem : binding.network;
+    if (!uiSourceCode.isDirty()) {
+      binding[Persistence.Persistence._muteWorkingCopy] = true;
+      other.resetWorkingCopy();
+      binding[Persistence.Persistence._muteWorkingCopy] = false;
+      this._contentSyncedForTest();
+      return;
+    }
+
     var target = Bindings.NetworkProject.targetForUISourceCode(binding.network);
     if (target.isNodeJS()) {
       var newContent = uiSourceCode.workingCopy();