DevTools: cleanup script UISourceCodes on executionContextDestroyed

third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js b/third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js
index e6e758ebf8e9f00ec11c4f008efe2ce9c7ba7d71..47e2602f7e37d9726ab57d836ba053eff32358a3 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js
@@ -346,6 +346,14 @@ SDK.DebuggerModel = class extends SDK.SDKModel {
   }
 
   /**
+   * @param {!SDK.ExecutionContext} executionContext
+   * @return {!Array<!SDK.Script>}
+   */
+  scriptsForExecutionContext(executionContext) {
+    return Object.values(this._scripts).filter(script => script.executionContextId === executionContext.id);
+  }
+
+  /**
    * @param {!Protocol.Runtime.ScriptId} scriptId
    * @param {string} newSource
    * @param {function(?Protocol.Error, !Protocol.Runtime.ExceptionDetails=)} callback