[DevTools] proper cleanup BlackboxManager on targetRemoved

third_party/WebKit/Source/devtools/front_end/bindings/BlackboxManager.js

Index: third_party/WebKit/Source/devtools/front_end/bindings/BlackboxManager.js
diff --git a/third_party/WebKit/Source/devtools/front_end/bindings/BlackboxManager.js b/third_party/WebKit/Source/devtools/front_end/bindings/BlackboxManager.js
index 6eabe872f160d94c8ddda5243faac834f364cac7..6b9e290b531d51b1c6275fbb96dcf31115b638d3 100644
--- a/third_party/WebKit/Source/devtools/front_end/bindings/BlackboxManager.js
+++ b/third_party/WebKit/Source/devtools/front_end/bindings/BlackboxManager.js
@@ -58,6 +58,11 @@ Bindings.BlackboxManager = class {
    * @param {!SDK.Target} target
    */
   targetRemoved(target) {
+    var debuggerModel = SDK.DebuggerModel.fromTarget(target);
+    if (debuggerModel) {
+      this._debuggerModelData.delete(debuggerModel);
+      this._isBlackboxedURLCache.clear();
+    }
   }
 
   /**