[Devtools] Removed NetworkRequest dependency on NetworkManager

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

Index: third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js b/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
index a7a6b816556c7549951b0b629b9b52ea392dee38..53a5e6c88ba307a67dad95cb32f5ccf55b5d2c80 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
@@ -64,7 +64,8 @@ SDK.ResourceTreeModel = class extends SDK.SDKModel {
    * @return {?SDK.ResourceTreeFrame}
    */
   static frameForRequest(request) {
-    var resourceTreeModel = request.networkManager().target().model(SDK.ResourceTreeModel);
+    var networkManager = SDK.NetworkManager.forRequest(request);
+    var resourceTreeModel = networkManager ? networkManager.target().model(SDK.ResourceTreeModel) : null;
     if (!resourceTreeModel)
       return null;
     return resourceTreeModel.frameForId(request.frameId);