DevTools: WI.NavigatorView._removeUISourceCode should not remove frame nodes

third_party/WebKit/Source/devtools/front_end/sources/NavigatorView.js

Index: third_party/WebKit/Source/devtools/front_end/sources/NavigatorView.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sources/NavigatorView.js b/third_party/WebKit/Source/devtools/front_end/sources/NavigatorView.js
index b90b2f91393b67c53ce5158aa6763f70769839a5..8f852d49c1a245fb696a005dbc9c9b4b8937f34a 100644
--- a/third_party/WebKit/Source/devtools/front_end/sources/NavigatorView.js
+++ b/third_party/WebKit/Source/devtools/front_end/sources/NavigatorView.js
@@ -486,6 +486,8 @@ WebInspector.NavigatorView.prototype = {
                 break;
             if (!(node instanceof WebInspector.NavigatorGroupTreeNode || node instanceof WebInspector.NavigatorFolderTreeNode))
                 break;
+            if (node._type === WebInspector.NavigatorView.Types.Frame)
+                break;
 
             var folderId = this._folderNodeId(project, target, frame, uiSourceCode.origin(), node._folderPath);
             this._subfolderNodes.delete(folderId);
@@ -905,7 +907,6 @@ WebInspector.NavigatorSourceTreeElement = function(navigatorView, uiSourceCode,
     this.tooltip = uiSourceCode.url();
     this.createIcon();
 
-
     this._navigatorView = navigatorView;
     this._uiSourceCode = uiSourceCode;
 }