DevTools: Use JS symbols instead of strings for eligible events.

third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js

Index: third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js
diff --git a/third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js b/third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js
index ae5338f76517d76cafb320edb361faf544fcc6c8..67e8b903ca81c9cf2e62a447760ad1505edfb7bf 100644
--- a/third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js
+++ b/third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js
@@ -353,14 +353,15 @@ WebInspector.Workspace = function()
     this._hasResourceContentTrackingExtensions = false;
 }
 
+/** @enum {symbol} */
 WebInspector.Workspace.Events = {
-    UISourceCodeAdded: "UISourceCodeAdded",
-    UISourceCodeRemoved: "UISourceCodeRemoved",
-    WorkingCopyChanged: "WorkingCopyChanged",
-    WorkingCopyCommitted: "WorkingCopyCommitted",
-    WorkingCopyCommittedByUser: "WorkingCopyCommittedByUser",
-    ProjectAdded: "ProjectAdded",
-    ProjectRemoved: "ProjectRemoved"
+    UISourceCodeAdded: Symbol("UISourceCodeAdded"),
+    UISourceCodeRemoved: Symbol("UISourceCodeRemoved"),
+    WorkingCopyChanged: Symbol("WorkingCopyChanged"),
+    WorkingCopyCommitted: Symbol("WorkingCopyCommitted"),
+    WorkingCopyCommittedByUser: Symbol("WorkingCopyCommittedByUser"),
+    ProjectAdded: Symbol("ProjectAdded"),
+    ProjectRemoved: Symbol("ProjectRemoved")
 }
 
 WebInspector.Workspace.prototype = {